gst1-plugins-good: add optional dependency on jack2

Jack2 audio server is part of buildroot, but the jack gst plugins are
disabled completely in gst1-plugins-good, whether or not jack2 is
selected. This changes the logic so that if the build system
determines that the jack2 audio server is selected, then the jack
plugins are enabled. If the plugins are enabled, then jack2 is also
added as a dependency to gst1-plugins-good.

Signed-off-by: Brad Love <brad@nextdimension.cc>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/gstreamer1/gst1-plugins-good/gst1-plugins-good.mk

@@ -25,13 +25,19 @@ GST1_PLUGINS_GOOD_CONF_OPTS = \
 
 # Options which require currently unpackaged libraries
 GST1_PLUGINS_GOOD_CONF_OPTS += \
-	--disable-jack \
 	--disable-libdv \
 	--disable-dv1394 \
 	--disable-shout2
 
 GST1_PLUGINS_GOOD_DEPENDENCIES = gstreamer1 gst1-plugins-base
 
+ifeq ($(BR2_PACKAGE_JACK2),y)
+GST1_PLUGINS_GOOD_CONF_OPTS += --enable-jack
+GST1_PLUGINS_GOOD_DEPENDENCIES += jack2
+else
+GST1_PLUGINS_GOOD_CONF_OPTS += --disable-jack
+endif
+
 ifeq ($(BR2_PACKAGE_LIBV4L),y)
 GST1_PLUGINS_GOOD_CONF_OPTS += --with-libv4l2
 GST1_PLUGINS_GOOD_DEPENDENCIES += libv4l