mpd: default to tremor input plugin

MPD requires at least one input plugin to build.
If there's none selected default to tremor (vorbis).

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/multimedia/mpd/Config.in

@@ -4,6 +4,7 @@ menuconfig BR2_PACKAGE_MPD
 	depends on BR2_USE_WCHAR
 	select BR2_PACKAGE_LIBGLIB2
 	select BR2_PACKAGE_LIBICONV if !BR2_ENABLE_LOCALE
+	select BR2_PACKAGE_MPD_TREMOR if !(BR2_PACKAGE_MPD_MAD || BR2_PACKAGE_MPD_MPG123 || BR2_PACKAGE_MPD_VORBIS || BR2_PACKAGE_MPD_WAVPACK || BR2_PACKAGE_MPD_FLAC || BR2_PACKAGE_MPD_MUSEPACK || BR2_PACKAGE_MPD_FFMPEG)
 	help
 	  MPD is a flexible, powerful, server-side application
 	  for playing music. Through plugins and libraries