lang/gnat-aux: Upgrade to gcc 4.6.2, add Fortran, Objective-C

Obvious additions:
1) Upgrades sync from gcc 4.6.1-RELEASE to gcc 4.6.2-RELEASE
2) New capability of building Fortran
3) New capability of building Objective-C
4) Building of all 5 languages (Ada,C,C++,ObjC,Fortran) now default
5) Fortran testsuite added
6) ObjC testsuite added

Behind the scenes:
1) Previously GNAT-Aux was built from a custom-built tarball.  Now real
   real gcc source files are used instead, but heavily patched.
2) The standard patch mechanism is not used.  Composite diff files are
   generated by dragonlace.net and they are applied as needed, and
   are located in the "files" directory
3) This might be the only gcc that doesn't use the monolithic source tar
   ball.  Depending on the options selected, the makefile updates its
   distfile list and only downloads what it needs, including testsuite
   files and dejagnu support.
4) All platforms are now built with unlimited stacksize command due to
   new issues with <platform>-stdint.h functionality.
5) All platforms use unlimited stacksize for Ada testing. Before it was
   limited to NetBSD x86_64.  This may have introduced a failure on
   NetBSD i386 though.  There were no other impacts according to the
   Ada testsuite results.
6) The PLIST automatic generation was significantly simplified, resulting
   in some variable deletion.
7) libstdc++ can't break testing now (forced to evaluate to true)
8) Unnecessary depends and USE_TOOLS removed
9) The includes-fixed directory is now removed from all platforms, arches
   now rather than problematic ones.  It seems that it can only make no
   difference or cause problems, so no reason to keep it around.
A) Unnecessary do-config phase "touches" removed.
B) Several fixes added to diff patches to improve testsuite results on
   c, c++, and fortran for all platforms.

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