Revert "main: Add test initialization function"

This reverts commit 7e69d1400a.

src/tests/clutter-test-utils.h

@@ -86,7 +86,13 @@ G_BEGIN_DECLS
 int \
 main (int argc, char *argv[]) \
 { \
-  meta_test_init ();\
+  char *display_name = g_strdup ("mutter-test-display-XXXXXX");\
+  int fd = g_mkstemp (display_name);\
+  meta_wayland_override_display_name (display_name);\
+  meta_override_compositor_configuration (META_COMPOSITOR_TYPE_WAYLAND,\
+                                          META_TYPE_BACKEND_X11_NESTED);\
+\
+  meta_init ();\
 \
   clutter_test_init (&argc, &argv); \
 \
@@ -94,6 +100,8 @@ main (int argc, char *argv[]) \
     units \
   } \
 \
+  close (fd);\
+  g_free (display_name);\
   return clutter_test_run (); \
 }