CMake Nightly Date Stamp
OS X: Encode -F framework search flag in per-language platform variable

Compilers for languages other than C and C++ on OS X may not understand
the -F framework search flag.  Create a new platform information
variable CMAKE_<LANG>_FRAMEWORK_SEARCH_FLAG to hold the flag, and set it
for C and CXX lanugages in the Platform/Darwin module.

Reported-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Merge topic 'osx-framework-search-flag' into next

2e13c36 OS X: Encode -F framework search flag in per-language platform variable
872db62 CMake Nightly Date Stamp