import gcc 4.7.3
Merge tag 'gcc_4.7.3', based on the patch from jprostko.

Tested builds with x86,x86_64,arm,ppc,mipsel

Conflicts:
	gcc/Makefile.in
	gcc/configure
	gcc/gcc/configure
	gcc/gcc/configure.ac
	gcc/gcc/crtstuff.c
	gcc/libgcc/config.host
gcc 4.7.3: fix remaining Haiku issues.