Travis: updated how to install dependencies on OS X

Clement Champetier · Clement Champetier · commit 9b28cf89d558 · 2016-08-01T11:30:13.000+02:00
* Same way to install third party than on Linux.
* Homebrew ffmpeg/libav formulas only install the ffmpeg/avconv
application (not the shared libraries...).
diff --git a/tools/travis/osx.install.deps.sh b/tools/travis/osx.install.deps.sh
@@ -16,4 +16,4 @@ pip install nose
 brew install freeglut
 
 # Main dependency
-brew install ${DEPENDENCY_NAME}
+./tools/travis/linux.install.deps.sh
