Log Message:
devel/gps: Build with USE_LANGUAGES+= ada

1) Remove lang/gnat-aux dependency
2) USE_LANGUAGES+= ada (invokes lang/gcc-aux dependency)
3) Restore use of pkgsrc wrappers
4) Unreferenced pragma added, required to build with lang/gcc-aux
5) Ada 2012 binding interpretation fixes added, required to build with
   lang/gcc-aux
6) GPRBuild-based packages require USE_LANGUAGES+= c++ fortran in addition
   to "c" and "ada" because GPRBUILD probes for these \ 
languages.  If they
   aren't on the language list, pkgsrc comes back with a warning message
   that causes gprbuild to throw an unhandled exception due to a regex
   failure.  devel/gps doesn't contain c++ or fortran despite the value of
   USE_LANGUAGES.