gst-plugins-bad: rsvg support needs C++ (but no longer GTK+)

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/multimedia/gst-plugins-bad/Config.in

@@ -288,9 +288,12 @@ config BR2_PACKAGE_GST_PLUGINS_BAD_PLUGIN_OPUS
 
 config BR2_PACKAGE_GST_PLUGINS_BAD_PLUGIN_RSVG
 	bool "rsvg"
-	depends on BR2_PACKAGE_LIBGTK2
+	depends on BR2_INSTALL_LIBSTDCPP
 	select BR2_PACKAGE_LIBRSVG
 
+comment "rsvg plugin requires a toolchain with C++ support"
+	depends on !BR2_INSTALL_LIBSTDCPP
+
 config BR2_PACKAGE_GST_PLUGINS_BAD_PLUGIN_SDL
 	bool "sdl"
 	select BR2_PACKAGE_SDL