test: remove failing test

This test never worked.

test/Makefile.am

@@ -18,7 +18,6 @@ check_PROGRAMS = \
 	test_libvlc_media \
 	test_libvlc_media_list \
 	test_libvlc_media_player \
-	test_libvlc_media_discoverer \
 	test_libvlc_slaves \
 	test_src_config_chain \
 	test_src_misc_variables \
@@ -82,8 +81,6 @@ test_libvlc_media_list_SOURCES = libvlc/media_list.c
 test_libvlc_media_list_LDADD = $(LIBVLC)
 test_libvlc_media_player_SOURCES = libvlc/media_player.c
 test_libvlc_media_player_LDADD = $(LIBVLC)
-test_libvlc_media_discoverer_SOURCES = libvlc/media_discoverer.c
-test_libvlc_media_discoverer_LDADD = $(LIBVLC)
 test_libvlc_slaves_SOURCES = libvlc/slaves.c
 test_libvlc_slaves_LDADD = $(LIBVLCCORE) $(LIBVLC)
 test_libvlc_meta_SOURCES = libvlc/meta.c