Enhance tst-xmmymm.sh to detect zmm register usage in ld.so (BZ #16194)

2d63a517 added support to save and
restore zmm register in the dynamic linker, but did not enhance
test-xmmymm.sh to detect accidental usage of these registers.  The
patch below adds that check.

The script has also been renamed to tst-ld-sse-use.sh.  To see the
minimal changes, run `git show -M`.

	[BZ #16194]
	* sysdeps/x86/tst-xmmymm.sh: Rename file to...
	* sysdeps/x86/tst-ld-sse-use.sh: ... this.  Check for zmm
	register usage.
	* sysdeps/x86/Makefile: Adjust.