Travis: Axe macOS GCC build

.travis-deps.sh

@@ -2,11 +2,6 @@
 if [ $TRAVIS_OS_NAME = "osx" ]; then
 	brew update
 	brew install qt5 ffmpeg imagemagick sdl2 libzip libpng
-	if [ "$CC" == "gcc" ]; then
-		brew install gcc@5
-		export CC=gcc-5
-		export CXX=g++-5
-	fi
 else
 	sudo apt-get clean
 	sudo add-apt-repository -y ppa:george-edison55/cmake-3.x

.travis.yml

@@ -7,8 +7,6 @@ matrix:
       compiler: gcc
     - os: osx
       compiler: clang
-    - os: osx
-      compiler: gcc
 
 before_install:
   - source ./.travis-deps.sh