* Makefile.in: Call gcc/ada/Makefile directly, not through the
intermediary of gcc/Makefile. Incorporate all necessary parts of
rules from gcc/ada/Make-lang.in, including extra gnatlib/gnattools
targets, rts-zfp, rts-ravenscar. Get needed bits of GCC
configuration from (new) gcc/libada-mk. Decide what gnatlib variant
to build in configure.ac, not here.
* configure.ac: Provide Makefile.in with the new information it needs,
such as GCC's tmake_file and xmake_file.
* configure: Regenerate.
From-SVN: r80711
80dab1828b