MobileVLCKit: remove libmad from the linking flags

It is under the GPL and in turn no longer part of the distribution

MobileVLCKit/MobileVLCKit.xcconfig

@@ -21,7 +21,6 @@ DVBPSI=$(VLC_CONTRIB_DIR)/lib/libdvbpsi.a
 FLAC=$(VLC_CONTRIB_DIR)/lib/libFLAC.a
 LIVE555=$(VLC_CONTRIB_DIR)/lib/libUsageEnvironment.a $(VLC_CONTRIB_DIR)/lib/libBasicUsageEnvironment.a $(VLC_CONTRIB_DIR)/lib/libgroupsock.a $(VLC_CONTRIB_DIR)/lib/libz.a $(VLC_CONTRIB_DIR)/lib/libliveMedia.a
 LUA=$(VLC_CONTRIB_DIR)/lib/liblua.a
-MAD=$(VLC_CONTRIB_DIR)/lib/libmad.a
 MKV=$(VLC_CONTRIB_DIR)/lib/libebml.a $(VLC_CONTRIB_DIR)/lib/libmatroska.a
 MODPLUG=$(VLC_CONTRIB_DIR)/lib/libmodplug.a
 OPUS=$(VLC_CONTRIB_DIR)/lib/libopus.a
@@ -31,4 +30,4 @@ SPEEX=$(VLC_CONTRIB_DIR)/lib/libspeex.a $(VLC_CONTRIB_DIR)/lib/libspeexdsp.a
 TAGLIB=$(VLC_CONTRIB_DIR)/lib/libtag.a $(VLC_CONTRIB_DIR)/lib/libtag_c.a
 XML=$(VLC_CONTRIB_DIR)/lib/libxml2.a
 
-OTHER_LIBTOOLFLAGS=$(AVCODEC) $(DVBPSI) $(FLAC) $(LIVE555) $(LUA) $(MAD) $(MKV) $(MODPLUG) $(OGG) $(OPUS) $(PICS) $(SPEEX) $(TAGLIB) $(XML) $(VLC_INSTALL_DIR)/lib/vlc/libcompat.a  $(VLC_INSTALL_DIR)/lib/libvlc.a $(VLC_INSTALL_DIR)/lib/libvlccore.a $(VLC_PLUGINS_LDFLAGS) $(OTHER_CFLAGS)
+OTHER_LIBTOOLFLAGS=$(AVCODEC) $(DVBPSI) $(FLAC) $(LIVE555) $(LUA) $(MKV) $(MODPLUG) $(OGG) $(OPUS) $(PICS) $(SPEEX) $(TAGLIB) $(XML) $(VLC_INSTALL_DIR)/lib/vlc/libcompat.a  $(VLC_INSTALL_DIR)/lib/libvlc.a $(VLC_INSTALL_DIR)/lib/libvlccore.a $(VLC_PLUGINS_LDFLAGS) $(OTHER_CFLAGS)