vect: disable bitmask tests on sparc

These testcases declare requiring vect_int which sparc declares as well however
sparc doesn't have an optab to vectorize comparisons so these testcases fail to
vectorize and so the tests fail.

As such best coure of action is to just skip them on sparc as comparisons are
somewhat expected from a target that can do SIMD.

gcc/testsuite/ChangeLog:

	PR tree-optimization/104755
	* gcc.dg/vect/vect-bic-bitmask-10.c: Disable sparc.
	* gcc.dg/vect/vect-bic-bitmask-11.c: Likewise.
	* gcc.dg/vect/vect-bic-bitmask-12.c: Likewise.
	* gcc.dg/vect/vect-bic-bitmask-2.c: Likewise.
	* gcc.dg/vect/vect-bic-bitmask-23.c: Likewise.
	* gcc.dg/vect/vect-bic-bitmask-3.c: Likewise.
	* gcc.dg/vect/vect-bic-bitmask-4.c: Likewise.
	* gcc.dg/vect/vect-bic-bitmask-5.c: Likewise.
	* gcc.dg/vect/vect-bic-bitmask-6.c: Likewise.
	* gcc.dg/vect/vect-bic-bitmask-8.c: Likewise.
	* gcc.dg/vect/vect-bic-bitmask-9.c: Likewise.