* builtins.c (std_expand_builtin_va_start): Remove unused
	first argument.
	(expand_builtin_va_start): Call EXPAND_BUILTIN_VA_START and
	std_expand_builtin_va_start with just two arguments.
	* expr.h: Update prototypes.

	* alpha-protos.h, alpha.h, alpha.c, arc-protos.h, arc.h,
	arc.c, d30v-protos.h, d30v.h, d30v.c, i386-protos.h, i386.h,
	i386.c, i960-protos.h, i960.h, i960.c, m88k-protos.h, m88k.h,
	m88k.c, mips-protos.h, mips.h, mips.c, mn10300-protos.h,
	mn10300.h, mn10300.c, pa-protos.h, pa.h, pa.c,
	rs6000-protos.h, rs6000.h, rs6000.c, s390-protos.h, s390.h,
	s390.c, sh-protos.h, sh.h, sh.c, sparc-protos.h, sparc.h,
	sparc.c, stormy16-protos.h, stormy16.h, stormy16.c,
	xtensa-protos.h, xtensa.h, xtensa.c:  Remove unused first
	argument from all implementations of EXPAND_BUILTIN_VA_START
	and all uses of std_expand_builtin_va_start.

From-SVN: r55495