vector-compare-4.c

This testcase fails on 32-bit powerpc-linux with

Excess errors:
/home/segher/src/gcc/gcc/testsuite/c-c++-common/vector-compare-4.c:31:1: warning: GCC vector returned by reference: non-standard ABI extension with no compatibility guarantee

Fix this as in vector-compare-2.c .


testsuite/
	* c-c++-common/vector-compare-4.c: Prune "non-standard ABI extension"
	warning.

From-SVN: r233093