Fix building of osdmenu plugin

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/video_filter/Modules.am

@@ -31,7 +31,10 @@ libosdmenu_plugin_la_SOURCES = osdmenu.c
 libosdmenu_plugin_la_CFLAGS = $(AM_CFLAGS) -DPKGDATADIR=\"$(vlcdatadir)\"
 libosdmenu_plugin_la_LIBADD = $(AM_LIBADD)
 libosdmenu_plugin_la_DEPENDENCIES =
-EXTRA_LTLIBRARIES += libosdmenu_plugin.la
+
+if BUILD_OSDMENU
+libvlc_LTLIBRARIES += libosdmenu_plugin.la
+endif
 
 SOURCES_remoteosd = remoteosd.c remoteosd_rfbproto.h
 SOURCES_magnify = magnify.c