ccached builds

[Sérgio Basto]

Hello,

If we could set copr to do ccached builds ? , sometimes I prefer use
local builds which use ccache , and after cache gcc compilation , I can
improve build times in 10 times more or less ... 
i.e. ccache could be very useful when we are trying fix FTBFS packages,
where things are broken in post stages of the builds . 

Thanks, 
-- 
Sérgio M. B.