libgudev: remove incorrect Config.in help text information

libgudev indeed used to be provided directly by eudev, but it's no
longer the case since eudev 3.1.3, and this has been already taken
into account in Buildroot in commit
6cfa5de33e71b46e9ae668550dc77aacabbde663. We simply forgot to update
the comment.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libgudev/Config.in

@@ -11,9 +11,6 @@ config BR2_PACKAGE_LIBGUDEV
 	  It's now a project on its own. Required for building some
 	  programs that use udev, when using systemd.
 
-	  When systemd is not used, libgudev is directly provided by
-	  eudev.
-
 	  https://wiki.gnome.org/Projects/libgudev
 
 comment "libgudev needs udev /dev handling and a toolchain w/ wchar, threads"