Log Message:
ccache: updated to 3.7.8

ccache 3.7.8

Bug fixes
Use $PWD instead of the real CWD (current working directory) when checking for \ 
CWD in preprocessed output. This fixes a problem when $PWD includes a symlink \ 
part and the user has set hash_dir = false.
Rewrote the Windows version of the lockfile routines. This should mitigate \ 
several problems with the old implementation.
If localtime_r fails the epoch time is now logged instead of garbage.

Other
Improved error message when a boolean environment variable has an invalid value.
Improved the regression fix in ccache 3.7.5 related to not passing \ 
compilation-only options to the preprocessor.
ccache’s PCH test suite now skips running the tests if it detects broken PCH \ 
compiler support.
Fixed unit test failure on Windows.
Fixed “stringop-truncation” build warning on Windows.
Improved “x_rename” implementation on Windows.
Improved removal of temporary file when rewriting absolute paths to relative in \ 
the dependency file.
Clarified “include_file_ctime sloppiness” in the Performance section in the \ 
manual.