https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284893
This patch makes ccache work in cases when compiler from the llvm port is used in cmake-based ports.
ccache has never worked in such cases because it only added ccache directory into PATH so that c++ the compiler would be substituted with the ccache enabled one. The patch adds cmake launcher in order to make ccache work when both USES=llvm and USES=cmake are present.
Thanks, Yuri
