package/gr-osmosdr: add an upstream URL to Config.in

Add an upstream URL to the help text in Config.in. This
addresses the 'Missing' URL status in the package stats
web page output.

Signed-off-by: Mark Corbin <mark@dibsco.co.uk>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/gr-osmosdr/Config.in

@@ -5,6 +5,8 @@ config BR2_PACKAGE_GR_OSMOSDR
 	help
 	  GNU Radio block for interfacing with various radio hardware
 
+	  http://osmocom.org/projects/osmosdr
+
 if BR2_PACKAGE_GR_OSMOSDR
 
 config BR2_PACKAGE_GR_OSMOSDR_PYTHON