package/gamin: remove stale Config.in include breaking build

The previous commit ce00b93d5 (package/gamin: drop package) forgot to
remove the package/gamin/Config include from package/Config.in, which
triggers the following error.

  package/Config.in:1645: can't open file "package/gamin/Config.in"
  make: *** [Makefile:1027: raspberrypi2_defconfig] Error 1

Signed-off-by: Brandon Maier <brandon.maier@collins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/Config.in

@@ -1642,7 +1642,6 @@ endif
 endmenu
 
 menu "Filesystem"
-	source "package/gamin/Config.in"
 	source "package/libconfig/Config.in"
 	source "package/libconfuse/Config.in"
 	source "package/libfuse/Config.in"