Minor fixes in sim, gold, gdb for Autoconf 2.64, Automake 1.11.

Minor fixes in sim, gold, gdb for Autoconf 2.64, Automake 1.11.

gold/:
	* Makefile.am (AUTOMAKE_OPTIONS): Add foreign.
	* testsuite/Makefile.am (AUTOMAKE_OPTIONS): Add foreign.
	* Makefile.in: Regenerate.
	* testsuite/Makefile.in: Regenerate.

gdb/:
	* configure.ac: Use AC_USE_SYSTEM_EXTENSIONS instead of
	AC_GNU_SOURCE, AC_AIX, AC_ISC_POSIX.

sim/common/:
	* aclocal.m4 (SIM_CHECK_MEMBER): Replace definition with
	definition of AC_CHECK_MEMBER.