package/sdl2: bump version to 2.0.18

Signed-off-by: Michael Fischer <mf@go-sys.de>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/sdl2/sdl2.hash

@@ -1,4 +1,4 @@
-# Locally calculated after checking http://www.libsdl.org/release/SDL2-2.0.16.tar.gz.sig
-sha256  65be9ff6004034b5b2ce9927b5a4db1814930f169c4b2dae0a1e4697075f287b  SDL2-2.0.16.tar.gz
+# Locally calculated after checking http://www.libsdl.org/release/SDL2-2.0.18.tar.gz.sig
+sha256  94d40cd73dbfa10bb6eadfbc28f355992bb2d6ef6761ad9d4074eff95ee5711c  SDL2-2.0.18.tar.gz
 # Locally calculated
 sha256  52d41d0c82507721ca1fd92c20dc2bf9ca531b3a288ef845a8275c550f118804  LICENSE.txt

package/sdl2/sdl2.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-SDL2_VERSION = 2.0.16
+SDL2_VERSION = 2.0.18
 SDL2_SOURCE = SDL2-$(SDL2_VERSION).tar.gz
 SDL2_SITE = http://www.libsdl.org/release
 SDL2_LICENSE = Zlib