This patch cleans up makefile targets related to the generation of
s-oscons.ads. We had duplicate rules between Make-generated.in and
gcc-interface/Makefile.in which caused confusion recently and are now removed.
The rules are now handled in Make-generated.in only, as was intended when
The previous patch is further cleaned up by removing the osconstool
target in libada/Makefile.in which was hard to maintain.
Tested on x86_64-pc-linux-gnu, committed on trunk.
libada/
* Makefile.in (osconstool): Removed, no longer needed.
