-mno-long-calls for mve_libcall tests

-mno-long-calls for mve_libcall tests

The implicit -mlong-calls used in our vxworks configurations changes
the call sequences from those expected in the mve_libcall testcases.

This patch brings the test output in line with the expectations, with
an explicit -mno-long-calls.

for  gcc/testsuite/ChangeLog

	* gcc.target/arm/mve/intrinsics/mve_libcall1.c: Pass an
	explicit -mno-long-calls.
	* gcc.target/arm/mve/intrinsics/mve_libcall2.c: Likewise.