pkgconf: update upstream URL in Config.in

The download location got changed two years ago when the version was bumped
to 0.9.12, but the upstream URL in Config.in wasn't updated.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/pkgconf/Config.in

@@ -6,4 +6,4 @@ config BR2_PACKAGE_PKGCONF
 	  but was written from scratch in the summer of 2011 to replace
 	  pkg-config, which now needs itself to build itself
 
-	  https://github.com/nenolod/pkgconf
+	  https://github.com/pkgconf/pkgconf