[ccache] Support for color diagnostics

[Lubos Lunak]

On Saturday 14 of June 2014, Joel Rosdahl wrote:
> Hi Lubos,
>
> Sorry about the ping delay. I've now looked at your patch and it looks
> promising.
...
> I suggest passing the argument list as an argument to the compiler_is_*
> functions instead of relying on global variables.
>
> When extracting the compiler name, I suggest using basename() from util.c.
> That way it will work on Windows as well.

 Attached is an updated patch that passes also all the tests.

-- 
 Lubos Lunak
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