Unbreak this port by applying the real patchset that was submitted  which
- adds USE_GCC since that's how libpvm3.a (a dependency) was built;
- renames namespace Pvm::Internal to avoid conflict with class Pvm::Internal;
- adds #include <stdlib.h> where required.
While we are at it, migrate from USE_GMAKE to USES=gmake.
PR: 182136 
Submitted by: Christoph Moench-Tegeder <email@example.com> 
Pointyhat to: gerald