testsuite: test builtin state

The second test, that creates the module by name and then retrieves the
initstate was broken before b95fa91 ('Fix race while loading modules').
We would check /sys and return either builtin (if the module has
parameters) or give an error because we don't find the module (even if
it's in the modules.builtin index)
diff --git a/Makefile.am b/Makefile.am
index b74e190..d8d1994 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -308,7 +308,9 @@
 	testsuite/test-hash \
 	testsuite/test-array \
 	testsuite/test-strbuf \
-	testsuite/test-init testsuite/test-testsuite testsuite/test-loaded \
+	testsuite/test-init \
+	testsuite/test-initstate \
+	testsuite/test-testsuite testsuite/test-loaded \
 	testsuite/test-modinfo testsuite/test-util testsuite/test-new-module \
 	testsuite/test-modprobe testsuite/test-blacklist \
 	testsuite/test-dependencies testsuite/test-depmod \
@@ -332,6 +334,8 @@
 
 testsuite_test_init_LDADD = $(TESTSUITE_LDADD)
 testsuite_test_init_CPPFLAGS = $(TESTSUITE_CPPFLAGS)
+testsuite_test_initstate_LDADD = $(TESTSUITE_LDADD)
+testsuite_test_initstate_CPPFLAGS = $(TESTSUITE_CPPFLAGS)
 testsuite_test_loaded_LDADD = $(TESTSUITE_LDADD)
 testsuite_test_loaded_CPPFLAGS = $(TESTSUITE_CPPFLAGS)
 testsuite_test_modinfo_LDADD = $(TESTSUITE_LDADD)