One test unrelated to this PR was failing when using a SDL2 host version 2.0.6

Reverting to SDL2 2.0.5

Author: dariost

.travis.yml

@@ -8,7 +8,7 @@ os:
 - linux
 - osx
 install:
-- wget https://www.libsdl.org/release/SDL2-2.0.6.tar.gz -O sdl2.tar.gz
+- wget https://www.libsdl.org/release/SDL2-2.0.5.tar.gz -O sdl2.tar.gz
 - tar xzf sdl2.tar.gz
 - pushd SDL2-* && ./configure && make && sudo make install && popd
 - wget -q https://www.libsdl.org/projects/SDL_ttf/release/SDL2_ttf-2.0.14.tar.gz