package/gst1-devtools: add optional gst1-rtsp-server dependency

Add optional gst1-rtsp-server dependency as checked for in
gst1-devtools-1.18.0/validate/tools/meson.build.

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/gstreamer1/gst1-devtools/gst1-devtools.mk

@@ -23,6 +23,10 @@ else
 GST1_DEVTOOLS_DEPENDENCIES += host-python python
 endif
 
+ifeq ($(BR2_PACKAGE_GST1_RTSP_SERVER),y)
+GST1_DEVTOOLS_DEPENDENCIES += gst1-rtsp-server
+endif
+
 GST1_DEVTOOLS_CONF_OPTS = \
 	-Dvalidate=enabled \
 	-Ddebug_viewer=disabled \