devel/gps: Fix build on upcoming gcc49
This port has to be bumped for two reasons:
1) It should have been built in production mode across the board.
There are some style check failures that appear in "debug" mode
due to gcc49 checks being more strict that gcc47 checks. Those
issues aren't fixed, but simply hidden by switching to production
which was desired anyway.
2) The project logic was looking for "gnatgcc", a leftover from the
gnat-aux days. The gcc-aux compilers call their drivers "gcc" as
expected by gps. This removes the patch for gnatgcc since the
original code is correct.