[ccache] Visual C/C++ compiler upgrade

[Jean-Dominique GASCUEL]

Dear ccache developers,

I just started a fork to try to make ccache compatible with Visual C/C++ 
compiler (cl), so one can use it with msbuild or nmake based projects...
You can review the current state here: https://github.com/jd-gascuel/ccache

Current state:
   - It starts to do something interesting. But more work is needed to 
handle specific options (.sbr files, debug options, etc.)
   - I found the Travis stuff very interesting. But because Travis do 
not support windows, I am trying to make an AppVeyor similar stuff.
  - There is probably issue about Visual vs. MinGW modes ... I did not 
start to investigate that.

Any advices ?

-- 
JD dot Gascuel at free dot fr
Tel: +33 (0)6 64 82 77 87