* Makefile.in: Revert most of Arnaud's last change. Prefer anything
over error-prone Make abuse. Remove temporary debug code.
(gnatlib-zcx): New target.
(gnattools): Split into gnattools-native, gnattools-cross, to fix
previous bug; select which on the basis of default_gnattools_target.
(ada.all.cross): Merged with gnattools-cross target.
* configure.ac: Set default_gnattools_target.
* configure: Regenerate.
From-SVN: r81128
* 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
