sync toplevel between GCC and src

[Paolo Bonzini]

>   ** adding target-newlib to noconfigdirs for powerpc-*-aix* and
>      rs6000-*-aix*,

This puzzles me.

>   ** adding target-libgloss to noconfigdirs for sh*-*-elf,

This is okay.

> - the files move from GPLv2 to GPLv3 header.  Is that a problem for
>   anything in src?

I honestly don't know.

> - in Makefile.tpl, there are new settings for CXX and CXX_FOR_BUILD in
>   POSTSTAGE1_HOST_EXPORTS, that might be responsible for
>   <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40950>, and I would hate
>   to just propagate this bug to src if it can be avoided.

This is not a problem since bootstraps are only done when combining the
gcc and src trees (and gcc always wins).

Paolo