Log Message:
www/aws: 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) Utilize custom capability of devel/gprbuild-aux Library_Options ("-R"
   and "-Wl,-R" to redefine rpaths of shared libraries to remove
   references to the work directory.  This error was highlighted by new
   updates to the PKG_DEVELOPER=yes checks.
5) Fix for Ada 2012 binding interpretation that prevented build on
   lang/gcc-aux.  (AI05-0115, aggregates with invisible components)
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.  www/aws doesn't contain c++ or fortran despite the value of
   USE_LANGUAGES.