testsuite/96147 - remove scanning for ! vect_hw_misalign

This removes scanning that's too difficult to get correct for all
targets, leaving the correctness test for them and keeping the
vectorization capability check to vect_hw_misalign targets.

2021-01-15  Richard Biener  <rguenther@suse.de>

	PR testsuite/96147
	* gcc.dg/vect/slp-43.c: Remove ! vect_hw_misalign scan.