modula2: Enable iso-extended-opaque-run-pass.exp to build library tests

This patch fixes the tcl test script iso-extended-opaque-run-pass.exp so
that the test library modules are built and included with the link command.

gcc/testsuite/ChangeLog:

	* gm2/projects/iso/small/run/pass/iso-extended-opaque-run-pass.exp:
	Compile object for stressset.mod and testlib.mod.  Add test so
	that we only link these	objects with test application objects.

Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>