eudev: add new package

eudev is a fork of systemd-udev which doesn't require all the
rest of systemd. It's suitable for running along with OpenWrt's procd,
eplacing the very outdated version of pre-systemd udev.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

utils/eudev/patches/0001-mtd_probe-uses-stdint_h.patch

@@ -0,0 +1,12 @@
+Index: eudev-3.1.5/src/mtd_probe/mtd_probe.h
+===================================================================
+--- eudev-3.1.5.orig/src/mtd_probe/mtd_probe.h
++++ eudev-3.1.5/src/mtd_probe/mtd_probe.h
+@@ -18,6 +18,7 @@
+  */
+ 
+ #include <mtd/mtd-user.h>
++#include <stdint.h>
+ 
+ #include "macro.h"
+