gst-plugins-base: add missing dependency on libxml2 for subparse

The gst-plugins-base configure script claims that the subparse plugin is
dependency-less - but it also silently disables subparse if libxml2 is
not available.  So depend on libxml2 when subparse is selected.

Note: the analogous gst1 subparse plugin does not have this requirement.

Signed-off-by: Danomi Manchego <danomimanchego123@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/gstreamer/gst-plugins-base/Config.in

@@ -46,9 +46,6 @@ config BR2_PACKAGE_GST_PLUGINS_BASE_PLUGIN_PLAYBACK
 	bool "playback (mandatory)"
 	default y
 
-config BR2_PACKAGE_GST_PLUGINS_BASE_PLUGIN_SUBPARSE
-	bool "subparse"
-
 config BR2_PACKAGE_GST_PLUGINS_BASE_PLUGIN_TCP
 	bool "tcp"
 
@@ -92,6 +89,10 @@ comment "pango plugin needs a toolchain w/ C++"
 	depends on !BR2_INSTALL_LIBSTDCPP
 	depends on BR2_TOOLCHAIN_HAS_SYNC_4
 
+config BR2_PACKAGE_GST_PLUGINS_BASE_PLUGIN_SUBPARSE
+	bool "subparse"
+	select BR2_PACKAGE_LIBXML2
+
 config BR2_PACKAGE_GST_PLUGINS_BASE_PLUGIN_THEORA
 	bool "theora (*.ogg video)"
 	select BR2_PACKAGE_LIBTHEORA

package/gstreamer/gst-plugins-base/gst-plugins-base.mk

@@ -111,6 +111,7 @@ endif
 
 ifeq ($(BR2_PACKAGE_GST_PLUGINS_BASE_PLUGIN_SUBPARSE),y)
 GST_PLUGINS_BASE_CONF_OPTS += --enable-subparse
+GST_PLUGINS_BASE_DEPENDENCIES += libxml2
 else
 GST_PLUGINS_BASE_CONF_OPTS += --disable-subparse
 endif