Removing default build of gcc

[Warner Losh]

On Jan 26, 2013, at 5:28 AM, Pedro Giffuni wrote:
> The situation is not too different from the fortran removal: for many reasons it is convenient to use a pre-packaged compiler for many ports. Gcc 4.2.1 is also becoming obsolete and is really difficult to maintain..

Removing it before all the pieces are in place is even more disruptive. They aren't there, and we need to get people to fix the broken stuff first.

Warner