testsuite: fixup pr97521.c and pr96713.c on i686-*

testsuite: fixup pr97521.c and pr96713.c on i686-*

On targets that do not have MXX/SSE enabled by default, pr97521
and pr96713 fail because they emit warnings:

pr97521.c:12:1: warning: MMX vector return without MMX enabled
                changes the ABI [-Wpsabi]
pr97521.c:11:1: note: the ABI for passing parameters with
                16-byte alignment has changed in GCC 4.6
pr97521.c:11:1: warning: SSE vector argument without SSE enabled
                changes the ABI [-Wpsabi]

Add -Wno-psabi to dg-options.

gcc/testsuite/ChangeLog:
	* gcc.target/i386/pr97521.c: Add -Wno-psabi to dg-options.
	* gcc.dg/analyzer/pr96713.c: Likewise.