debug: add startup printf to diagnose Windows segfault

Author: hypernewbie

tests/test_main.cpp

@@ -46,4 +46,10 @@
 #include "test_lifecycle.cpp"
 #include "test_atlas.cpp"
 
-UTEST_MAIN();
+UTEST_STATE();
+int main(int argc, const char *const argv[])
+{
+	printf("TEST_MAIN_STARTED\n");
+	fflush(stdout);
+	return utest_main(argc, argv);
+}