gst1-plugins-base: alsa now needs seq

A seq (midi) source has been added to gst-plugins-base 1.8.x hence we
need to account for it, so select BR2_PACKAGE_ALSA_LIB_SEQ. Fixes:
http://autobuild.buildroot.net/results/474/474e4b9bc3a44224302d0576cf1c0de7ce709f1a/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/gstreamer1/gst1-plugins-base/Config.in

@@ -111,6 +111,7 @@ config BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_ALSA
 	select BR2_PACKAGE_ALSA_LIB
 	select BR2_PACKAGE_ALSA_LIB_MIXER
 	select BR2_PACKAGE_ALSA_LIB_PCM
+	select BR2_PACKAGE_ALSA_LIB_SEQ
 	help
 	  ALSA plugin library