Add gem stress test

Not where I want it to be, yet. And not as good as I've hoped in detecting
broken kernels.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 0c6452d..ce2f891 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -1,3 +1,7 @@
+bin_PROGRAMS = \
+	gem_stress \
+	$(NULL)
+
 TESTS = getversion \
 	getclient \
 	getstats \