Since commit 4fbdce2b (try_compile: Use random executable file name,
2012-02-13) a different <target>.dir is used for each try-compile.
Cleanup the directories as well as their content to avoid accumulating
leftover temporary directories.
(upstream git commit 953257ca611526c9a161a22e5148802be1c67649)
Remove troublesome "Qt4Deploy" and "CTest.UpdateCVS" tests
(from gentoo's package/dev-util/cmake/files/)
Sync FindPkgConfig.cmake patch with upstream
