test travis homebrew fix

.travis.yml

@@ -32,7 +32,7 @@ before_install:
 - git submodule update --init --recursive
 # - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo ln -s /usr/bin/gcc-6 /usr/local/bin/gcc; sudo ln -s /usr/bin/g++-6 /usr/local/bin/g++; fi
 - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then 
-  ls /usr/local/include ; mv /usr/local/include /usr/local/include-bak;
+  ls /usr/local/include ; sudo mv /usr/local/include /usr/local/include-bak;
   brew update; brew install freetype libevent sqlite lua dylibbundler;
   ls /usr/local/include ; fi
 #- if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then curl --retry 5 --connect-timeout 30 --location --remote-header-name --remote-name http://downloads.sourceforge.net/irrlicht/irrlicht-1.8.4.zip; unzip irrlicht-1.8.4.zip ; cd irrlicht-1.8.4/ ; cp ../premake/irrlicht/irrlicht-mac.patch . ; patch -p1 < irrlicht-mac.patch ; cd source/Irrlicht/MacOSX/ ; xcodebuild -project MacOSX.xcodeproj ; cp build/Release/libIrrlicht.a /usr/local/lib/ ;  cp -r ../../../include /usr/local/include/irrlicht ; cd ../../../../ ; fi