Travis: Blind fix for SDL+GL3 project on the Travis build setup.

Examples: SDL+GL3: Makefile blind fix for OSX (untested) (#1229, #1209)

.travis.yml

@@ -9,7 +9,7 @@ compiler:
   - clang
 
 before_install:
-  - if [ $TRAVIS_OS_NAME == linux ]; then sudo add-apt-repository -y ppa:pyglfw/pyglfw && sudo apt-get update -qq && sudo apt-get install -y --no-install-recommends libglfw3-dev libxrandr-dev libxi-dev libxxf86vm-dev libsdl2-dev; fi
+  - if [ $TRAVIS_OS_NAME == linux ]; then sudo add-apt-repository -y ppa:pyglfw/pyglfw && sudo apt-add-repository --yes ppa:zoogie/sdl2-snapshots && sudo apt-get update -qq && sudo apt-get install -y --no-install-recommends libglfw3-dev libxrandr-dev libxi-dev libxxf86vm-dev libsdl2-dev; fi
   - if [ $TRAVIS_OS_NAME == osx ]; then brew update && brew install glfw3 && brew install sdl2; fi
 
 script: 

examples/sdl_opengl3_example/Makefile

@@ -31,9 +31,9 @@ endif
 
 ifeq ($(UNAME_S), Darwin) #APPLE
 	ECHO_MESSAGE = "Mac OS X"
-	LIBS = -framework OpenGL -framework Cocoa -framework IOKit -framework CoreVideo -framework SDL2
+	LIBS = -framework OpenGL -framework Cocoa -framework IOKit -framework CoreVideo `sdl2-config --libs`
 
-	CXXFLAGS = -I../../ -I../libs/gl3w -I/usr/local/include -I /Library/Frameworks/SDL2.framework/Headers
+	CXXFLAGS = -I../../ -I../libs/gl3w -I/usr/local/include `sdl2-config --cflags`
 	CXXFLAGS += -Wall -Wformat
 	CFLAGS = $(CXXFLAGS)
 endif