package/vlc: Add libsidplay2 as optional dependency

vlc has a sid plugin:

$ output/host/usr/bin/i586-buildroot-linux-uclibc-readelf -a
  output/target/usr/lib/vlc/plugins/demux/libsid_plugin.so |
  grep NEEDED | grep sid
 0x00000001 (NEEDED)     Shared library: [libsidplay2.so.1]
 0x00000001 (NEEDED)     Shared library: [libresid-builder.so.0]

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/vlc/vlc.mk

@@ -206,6 +206,13 @@ else
 VLC_CONF_OPTS += --disable-svg --disable-svgdec
 endif
 
+ifeq ($(BR2_PACKAGE_LIBSIDPLAY2),y)
+VLC_CONF_OPTS += --enable-sid
+VLC_DEPENDENCIES += libsidplay2
+else
+VLC_CONF_OPTS += --disable-sid
+endif
+
 ifeq ($(BR2_PACKAGE_LIBTHEORA),y)
 VLC_CONF_OPTS += --enable-theora
 VLC_DEPENDENCIES += libtheora