rtl8188eu: bump to latest commit

The rtl8188eu driver wouldn't build due to Linux kernel API changes.

Several fixes for API changes to Linux kernel >=4.11 has been commited
to the repository.

I have bumped to the latest commit and verified that it builds on master
(also successfully built on the 2018.08 branch).

Signed-off-by: William Wennerström <william@willeponken.me>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/rtl8188eu/rtl8188eu.hash

@@ -1,2 +1,2 @@
 # Locally computed
-sha256 9f16fab009bd7bc9e377cf7dcdf82be1b60e7f88e27f2833eea5b422d104e3fe rtl8188eu-ced2b64a1139dcaf86947e3a9f7617dffbd64239.tar.gz
+sha256 cc872aa0991c044d35abfcc81543bad950c6aae487e37d5a09d1cbf8c4cb3058 rtl8188eu-4b0ecca485b9f11f58670b69aa9f90ecad7da02f.tar.gz

package/rtl8188eu/rtl8188eu.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-RTL8188EU_VERSION = ced2b64a1139dcaf86947e3a9f7617dffbd64239
+RTL8188EU_VERSION = 4b0ecca485b9f11f58670b69aa9f90ecad7da02f
 RTL8188EU_SITE = $(call github,lwfinger,rtl8188eu,$(RTL8188EU_VERSION))
 RTL8188EU_LICENSE = GPL-2.0, proprietary (rtl8188eufw.bin firmware blob)
 RTL8188EU_LICENSE_FILES = COPYING