package/mpd: upnp needs curl

Since switch to meson-package, upnp requires curl:
https://github.com/MusicPlayerDaemon/MPD/commit/94592c14062d5afc9482d11baa401648082022c0

Fixes:
 - http://autobuild.buildroot.org/results/1276d4be7270be6feada5d5c8b9e31db563ccc97

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/mpd/Config.in

@@ -350,6 +350,7 @@ config BR2_PACKAGE_MPD_UPNP
 	bool "UPnP"
 	select BR2_PACKAGE_EXPAT
 	select BR2_PACKAGE_LIBUPNP18 if !BR2_PACKAGE_LIBUPNP
+	select BR2_PACKAGE_MPD_CURL
 	help
 	  Enable MPD UPnP client support.