Log Message:
ccache: updated to 4.9.1

Ccache 4.9.1

Bug fixes

Improved detection of bad remote storage URLs gracefully. This also fixes \ 
crashes seen in ccache’s own test suite.
Made caching completely disabled when modification of a source or include file \ 
is detected during ccache invocation. Previously this was only done for the \ 
direct mode.
Fixed an MSVC crash when using /Zi with many concurrent compilations.
Fixed a crash when -arch is the last compiler option.