FindImageMagick: Search quantum depth suffixes (#13859)

From ImageMagick's 6.8.0-8 changelog:

  http://www.imagemagick.org/script/changelog.php
  ABI is incompatible if quantum depth change.
  Add abi indication to library name.

Search for library names with -Q16 and -Q8 suffixes.

Reported-by: Evangelos Foutras <evangelos@foutrelis.com>
Only process transitive interface properties for valid target names.

Commit a1c4905f (Use the link information as a source of compile
definitions and includes., 2013-02-12) introduced the use of link
information as the source of target properties via the TARGET_PROPERTY
generator expression. This generator expression has a strict
interpretation of a valid target name and emits a fatal error for
invalid names.

Ensure that only targets with names valid for use with TARGET_PROPERTY
or targets which are determined by generator expressions are processed
by it. This means that at worst, invalid target names do not participate
in the transitive evaluation of properties, but the validation
generator expression can be extended where needed to resolve that.
fix Windows processor detection

Thanks to Martin Koller for this.
Mention that IMPORTED targets may be created by a find_package call.
Remove unused parameters from target_link_libraries tests.
CPack: Fix NSIS version check without release version (#9721)

Only check a release version for the minimum required version.  If NSIS
returns a CVS build version string (as when built by Macports), skip the
version check altogether and assume a sufficiently new version.  Also
correctly handle the case where the version check fails and the
CPACK_TOPLEVEL_DIRECTORY option is not set.

Co-Author: Graham Menhennitt <graham@menhennitt.com.au>
VS: Avoid empty source groups in some cases (#3474)

Teach the WriteGroup method return true if a group or any of its
children have source files.  Have children write their output to a
temporay cmOStringStream.  Add it to the real output only if not empty.
install(EXPORT): Force absolute paths for usr-move

If the absolute install(EXPORT) destination for the CMAKE_INSTALL_PREFIX
used during configuration is under (/usr)?/lib(64)? then assume the
current build is for a system package installation instead of a
relocatable distribution.  Generate an absolute path for _IMPORT_PREFIX
in the target exports file instead of generating code to compute the
value relative to the file location.  This is necessary for
distributions implementing a move to /usr such as:

 https://wiki.archlinux.org/index.php/DeveloperWiki:usrlib
 "All files in the /lib directory have been moved to /usr/lib and now
  /lib is a symlink to usr/lib."

The relative path computation is not reliable because the targets file
could be installed through cross-prefix a symlink and loaded without it
or vice versa.

A similar change was made for package configuration file generation by
commit d4774140 (configure_package_config_file: force absolute paths for
usr-move, 2013-01-24).
Ninja: use MinGW generator code in EnableLanguage()
Ninja: escape line breaks in literals

BUG: 13591
Ninja: the Ninja generator does not support Fortran yet.
AIX: Do not use -brtl to create shared libraries (#13997)

The flag was added incorrectly by commit 9c3a6eb4 (Need -brtl when creating
shared libraries, 2003-05-16).  According to "man ld" the -G option implies
"-brtl -bnortllib ...", -brtl implies "-brtllib", and -brtllib should only be
used for executables, not shared libraries.  Therefore it is incorrect and
unnecessary to specify -brtl explicitly after -G.

Reported-by: Kevin Burge <kcburge@gmail.com>
CMake Nightly Date Stamp
Documentation: Clarify a few subtleties

* Clarify accepted values of <LANG> suffix in CMAKE_COMPILER_IS_GNU<LANG>.

* Clarify fact that target property GENERATOR_FILE_NAME usually cannot be
  used at configure time.

* Clarify that enable_language() can only be used in global scope of
  top-level project using language.

* State that enable_language(... OPTIONAL) currently doesn't work.

* Document regular expression operator precedence.
add_subdirectory: Compute output dir with consistent slashes (#10072)

When the command is invoked without an explicit build directory path we
compute it from the source directory path.  When either the source or
build tree is the root of a Windows drive letter it will have a trailing
slash.  Handle slashes consistently when substituting the current output
directory for the current source directory.

While at it, use cmSystemTools::IsSubDirectory instead of FindLastString
to verify that the source directory is a subdirectory.

Inspired-by: Graham Menhennitt <graham@menhennitt.com.au>
FindCUDA: Remove linkage against CUDA driver library (#13084)

The CUDA runtime library (libcudart) doesn't depend on the driver API
library (libcuda) and shouldn't be used to link CUDA run time codes.
FindCUDA: Add support for separable compilation

This adds a new variable, CUDA_SEPARABLE_COMPILATION, and two new
functions, CUDA_COMPUTE_SEPARABLE_COMPILATION_OBJECT_FILE_NAME and
CUDA_LINK_SEPARABLE_COMPILATION_OBJECTS.

When CUDA_SEPARABLE_COMPILATION is specified then CUDA runtime objects
will be compiled with the separable compilation flag.  These object
files are collected in a target named variable that can be used in
CUDA_COMPUTE_SEPARABLE_COMPILATION_OBJECT_FILE_NAME and
CUDA_LINK_SEPARABLE_COMPILATION_OBJECTS.
FindCUDA: Added cupti library.

In addition to adding the cupti library, find_local_library_first has
been renamed to cuda_find_local_library_first with a backward
compatibility macro to find_local_library_first.  Also added
cuda_find_local_library_first_with_path_ext to handle different paths.
Restore support for target names with '+' (#13986)

Extend the range of valid target names with the + sign.  This character
can commonly be used for target names, such as those containing 'c++'.
Add a test but skip it for Borland and Watcom tools which do not support
the character.

Suggested-By: Benjamin Kloster
FindQt4: Do not use qmake from Qt5

Wihtout this, if qmake binary is from Qt5 the FindQt4 fails even though
the Qt4 version of qmake would be installed as qmake-qt4.

On Archlinux this is the case.

Reviewed-by: Clinton Stimpson <clinton@elemtech.com>