Fix test failing on sparc

SPARC does not support vectorizing conditions, which this test relies
on. Use vect_condition as effective target.

Committed as obvious.

PR testsuite/116500

gcc/testsuite/ChangeLog:

	* gcc.dg/vect/vect-switch-ifcvt-1.c: Use vect_condition to
	check if vectorizing conditions is supported for target.

gcc/testsuite/gcc.dg/vect/vect-switch-ifcvt-1.c

@@ -1,4 +1,4 @@
-/* { dg-require-effective-target vect_int } */
+/* { dg-require-effective-target vect_condition } */
 #include "tree-vect.h"
 
 extern void abort (void);