testsuite: Enable builtins-3-p9.c on BE targets.

This patch removes the unnecessary "le" target requirement
of the builtins-3-p9.c testcase.

gcc/testsuite/ChangeLog:

2020-10-16  David Edelsohn  <dje.gcc@gmail.com>

	* gcc.target/powerpc/builtins-3-p9.c: Remove le.

gcc/testsuite/gcc.target/powerpc/builtins-3-p9.c

@@ -1,4 +1,4 @@
-/* { dg-do compile { target { le } } } */
+/* { dg-do compile } */
 /* { dg-require-effective-target powerpc_p9vector_ok } */
 /* { dg-options "-mdejagnu-cpu=power9 -O1" } */