CMake Nightly Date Stamp
SelectLibraryConfigurations: Fix for cached <base>_LIBRARY

The line

  set( ${basename}_LIBRARY )

removes the normal variable, but if the corresponding cached variable is
present then line

  list( APPEND ${basename}_LIBRARY optimized "${_libname}" )

uses that and fails.  Replace the original line with

  set( ${basename}_LIBRARY "" )

to set the normal variable to empty instead of unsetting it.
Merge topic 'SelectLibraryConfigurations-cached-library' into next

c4bcc56 SelectLibraryConfigurations: Fix for cached <base>_LIBRARY
VS: Clarify Visual Studio product year for each version

Add to the brief documentation of the Visual Studio 10, 11, and 12
generators the corresponding VS product year.  Clarify that VS11 is for
Visual Studio 2012, and VS12 is for Visual Studio 2013.
Merge topic 'vs-generator-brief-doc-update' into next

52f1464 VS: Clarify Visual Studio product year for each version
Merge branch 'SelectLibraryConfigurations-cached-library' into release
Merge branch 'FixAsmSupport' into release
Merge branch 'sha2-alignment' into release
Merge branch 'curl-bug-1192' into release
Merge branch 'vs12-generator' into release
Merge branch 'vs-generator-brief-doc-update' into release
Merge branch 'master' into next
Merge topic 'vs-generator-brief-doc-update'

52f1464 VS: Clarify Visual Studio product year for each version
CMake 2.8.11.2
Merge topic 'SelectLibraryConfigurations-cached-library'

c4bcc56 SelectLibraryConfigurations: Fix for cached <base>_LIBRARY
Merge branch 'release' into test-release
Merge topic 'test-release' into next

710e96b Merge branch 'release' into test-release
3bff90f CMake 2.8.11.2
acff729 Merge branch 'vs-generator-brief-doc-update' into release
c9697fa Merge branch 'vs12-generator' into release
8857afa Merge branch 'curl-bug-1192' into release
04897c0 Merge branch 'sha2-alignment' into release
d9ece45 Merge branch 'FixAsmSupport' into release
5bcca28 Merge branch 'SelectLibraryConfigurations-cached-library' into release
Merge topic 'make-depends-collapse-paths'

551d334 cmDependsC: Collapse relative include paths
Merge topic 'FindGTK2vs11'

eb16301 FindGTK2: Do not fail on MSVC11 if vc100 libraries are available
Merge topic 'FindGTK2vd2'

60e4555 FindGTK2: Add GTK2_DEFINITIONS variable