[Bug 1547165] perl-ExtUtils-CBuilder should require gcc

https://bugzilla.redhat.com/show_bug.cgi?id=1547165

--- Comment #3 from Paul Howarth  ---
Looking at the gcc-removal.txt file, all of the failures mentioning EU::CB are
failing when trying to run gcc rather than g++.

So I'm inclined to add a hard dependency on gcc (the module is pretty much
useless without it) and a soft one on gcc-c++.