Xcode: Fix duplicate target subfolders (#14133)

Fix logic introduced by commit eeeeca10 (XCode: Support target folders
on XCode, 2011-02-20) to avoid duplicate subfolders.  The problem was
that no slash was appended to the curr_tgt_folder string on the it !=
this->TargetGroup.end() path.
OS X: Fix app bundle search path during cross compiling (#14603)

In "Modules/Platform/Darwin.cmake" the variable _apps_paths stays empty
if cross compiling.  Do not de-duplicate an empty list.
cmake: Fix mt return value when hosted on posix (#14605)

On posix platforms return values are limited to a range from 0 to 255.
Cross compiling/linking with MSVC on linux/wine leads to a
misinterpretation of the return value 1090650113 of mt.exe.
Fix CMAKE_(C|CXX|Fortran)_RELEASE helpstrings (#14606)

Remove the platform-specific description from the cache entry help
strings for these variables.
Make CMAKE_(C|CXX|Fortran)_<CONFIG> help strings more consistent (#14606)

Use consistent capitalization and write all words out in the cache entry
descriptions.
ProcessorCount: make it work on Haiku
Fix CMAKE_(C|CXX|Fortran)_STANDARD_LIBRARIES helpstrings (#14622)

s/defalut/default/

Reported-by: Stephan Tolksdorf <st@quanttec.com>
Merge topic 'xcode-folder-dedup'

2dcb1dc Xcode: Fix duplicate target subfolders (#14133)
Merge topic 'osx-cross-compile-fixup'

3189ed3 OS X: Fix app bundle search path during cross compiling (#14603)
Merge topic 'cmake-mt-return-value'

d384b5a cmake: Fix mt return value when hosted on posix (#14605)
Merge topic 'lang-flag-var-helpstrings'

5d2452d Fix CMAKE_(C|CXX|Fortran)_STANDARD_LIBRARIES helpstrings (#14622)
2b77b53 Make CMAKE_(C|CXX|Fortran)_<CONFIG> help strings more consistent (#14606)
424c6fc Fix CMAKE_(C|CXX|Fortran)_RELEASE helpstrings (#14606)
Merge topic 'Haiku-CPU-count'

eef42a0 ProcessorCount: make it work on Haiku