devel/ccache4: new port

ccache is a compiler cache.  It acts as a caching pre-processor to C/C++
compilers, using the -E compiler switch and a hash to detect when a
compilation can be satisfied from cache.  This often results in a 5 to 10
times speedup in common compilations.

PR:		234971
Approved by:	bdrewery
Author:    Oleg Sidorkin <osidorkin@gmail.com>