Trouble building master with ccache on Windows

[d.ostrovsky at idaia.de]

Quoting Kohei Yoshida <kohei.yoshida at gmail.com>:

> On Tue, Mar 19, 2013 at 6:51 PM, David Ostrovsky  
> <d.ostrovsky at idaia.de> wrote:
>
>> Anyway gcc-wrapper should work with ccache enabled now:
>> https://gerrit.libreoffice.org/#/c/2857/
>
> Yup, I confirm that it works now. :-)
>
After thinking about it i think we would better teach gcc-wrapper to
handle ccache case natively instead of stripping that information during
gcc-wrapper call.

Otherwise all gcc-wrapped external projects not aware of ccache.
And this is what we want to achieve in the first place.

@Peter: could you have a look?
To check in gcc-wrapper that "REAL_CC" and "REAL_CXX" could have
`ccache` prefixed and handle that case correspondingly?

Thanks
David