mplayer: disable LIVE555 Streaming Media

LIVE555 was installed on the build system and was recognized by configure:
Checking for LIVE555 Streaming Media libraries ... yes (using distribution version)

Later this led to a linker error:
ld: cannot find -lliveMedia

Disable LIVE555, since it's not available in Buildroot.

Signed-off-by: Markus Heidelberg <markus.heidelberg@web.de>

package/multimedia/mplayer/mplayer.mk

@@ -63,6 +63,7 @@ $(MPLAYER_DIR)/.configured: $(MPLAYER_DIR)/.unpacked
 		--disable-mpdvdkit \
 		--disable-ivtv \
 		--disable-tv \
+		--disable-live \
 		--enable-dynamic-plugins \
 	)
 	touch $@