Add SYSV message queue test

This patch adds a simple SYSV message queue test to check for correct
argument passing on kernel.  The idea is neither to be an extensive
testing nor to check for any specific Linux test.

	* sysvipc/Makefile (tests): Add test-sysvmsg.
	* sysvipc/test-sysvmsg.c: New file.
	* test-skeleton.c (FAIL_UNSUPPORTED): New define.