testsuite: Add -Wno-psabi to pr113126.c test

testsuite: Add -Wno-psabi to pr113126.c test

I've missed
FAIL: gcc.dg/torture/pr113126.c   -O0  (test for excess errors)
etc. regressions on i686-linux since January.  The problem is obvious
Excess errors:
.../gcc/testsuite/gcc.dg/torture/pr113126.c:11:1: warning: MMX vector return without MMX enabled changes the ABI [-Wpsabi]
and I've added -Wno-psabi to dg-additional-options to fix that up.

2024-03-26  Jakub Jelinek  <jakub@redhat.com>

	* gcc.dg/torture/pr113126.c: Add -Wno-psabi as dg-additional-options.