Sync toplevel and config from GCC.

Sync toplevel and config from GCC.

/:
	Sync from GCC:

	2010-09-30  Michael Eager  <eager@eagercon.com>

	* configure.ac (microblaze): Add target-libssp to noconfigdirs.
	* configure: Regenerate.

	2010-09-21  Iain Sandoe  <iains@gcc.gnu.org>

	* configure.ac (enable-lto): Add Darwin to the list of supported lto
	targets and amend comment.
	* configure: Regenerate.

	2010-09-03  Jack Howarth <howarth@bromo.med.uc.edu>

	* configure.ac: Enable LTO by default on Darwin.
	* configure: Regenerate.

	2010-07-23  Marc Glisse <marc.glisse@normalesup.org>

	PR bootstrap/44455
	* configure.ac (extra_mpfr_configure_flags): Copy from
	extra_mpc_gmp_configure_flags.
	* configure: Re-generated.

config/:
	Sync from GCC:

	2010-09-10  Jonathan Yong  <jon_y@users.sourceforge.net>

	* dfp.m4: Enable decimal float for i?86 cygwin
	and mingw, and for x86_64 mingw.