Log Message:
ccache 3.2.5

New features and improvements
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Only pass clang-specific `-stdlib=` to the preprocessor.
- Improved handling of stale NFS handles.
- Made it harder to misinterpret documentation of boolean environment settings'
  semantics.

Bug fixes
~~~~~~~~~
- Include m4 files used by configure.ac in the source dist archives.
- Corrected "Performance" section in the manual regarding `__DATE_`, \ 
`__TIME__`
  and `__FILE__` macros.
- Fixed build on Solaris 10+ and AIX 7.
- Fixed failure to create directories on QNX.
- Don't (try to) update manifest file in ``read-only'' and ``read-only direct''
  modes.
- Fixed a bug in caching of `stat` system calls in ``file_stat_matches
  sloppiness mode''.
- Fixed bug in hashing of clang plugins, leading to unnecessary cache misses.
- Fixed --print-config to show ``pch_defines sloppiness''.
- The man page is now built when running ``make install'' from Git repository
  sources.