libgudev: remove systemd dependency

Since version 3.1.3 eudev doesn't provide internal libgudev,
so this package can now be used as an ordinary stand-alone
package.

[Peter: add BR2_PACKAGE_HAS_UDEV dependency]
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Reviewed-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libgudev/Config.in

@@ -1,6 +1,6 @@
 config BR2_PACKAGE_LIBGUDEV
 	bool "libgudev"
-	depends on BR2_INIT_SYSTEMD
+	depends on BR2_PACKAGE_HAS_UDEV
 	depends on BR2_USE_WCHAR # gettext
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on BR2_USE_MMU # fork()
@@ -16,7 +16,7 @@ config BR2_PACKAGE_LIBGUDEV
 
 	  https://wiki.gnome.org/Projects/libgudev
 
-comment "libgudev needs a toolchain w/ wchar, threads"
+comment "libgudev needs udev /dev handling and a toolchain w/ wchar, threads"
 	depends on BR2_USE_MMU
-	depends on BR2_INIT_SYSTEMD
-	depends on !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS
+	depends on !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS || \
+		!BR2_PACKAGE_HAS_UDEV