test: Disable test_media_list_player as it deadlocks.

test/Makefile.am

@@ -11,14 +11,15 @@ check_PROGRAMS = \
 	test_libvlc_core \
 	test_libvlc_events \
 	test_libvlc_media_list \
-	test_libvlc_media_list_player \
 	test_libvlc_media_player \
 	test_src_misc_variables \
         $(NULL)
 
 # Disabled test:
 # meta: No suitable test file
+# media_list_player: deadlocks.
 EXTRA_PROGRAMS = \
+	test_libvlc_media_list_player \
 	test_libvlc_meta \
 	test_dummy \
 	$(NULL)