re PR other/18138 (libgcc_s.so.1 not found by 64-bit testsuite)

gcc/testsuite:
	PR other/18138
	* lib/g++.exp: Accept more than one multilib libgcc.
	* lib/gcc-dg.exp: Likewise.
	* lib/objc.exp: Likewise.
	* lib/treelang.exp: Likewise.
	* lib/gfortran.exp: Likewise.

libffi:
	PR other/18138
	* testsuite/lib/libffi-dg.exp: Accept more than one multilib
	libgcc.

libjava:
	PR other/18138
	* testsuite/lib/libjava.exp: Accept more than one multilib
	libgcc.

libmudflap!:
	PR other/18138
	* testsuite/lib/libmudflap.exp: Accept more than one multilib
	libgcc.

libstdc++-v3:
	PR other/18138
	* testsuite/lib/libstdc++.exp: Accept more than one multilib
	libgcc.

From-SVN: r89528