CHG: fixing some scripts for Travis CI...

.travis.yml

@@ -26,10 +26,12 @@ before_install:
 ## Install mainline ARM toolchain.  gcc-arm-none-eabi is available
 ## in Ubuntu >= 14.04, but this external PPA is needed for 12.04.
 before_script:
-  - sudo apt-add-repository 'deb http://archive.ubuntu.com/ubuntu trusty main universe multiverse restricted'
-  - sudo apt-get update -qq
-  - sudo apt-get install -y gcc-arm-none-eabi
-  - git fetch --all
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; 
+   sudo apt-add-repository 'deb http://archive.ubuntu.com/ubuntu trusty main universe multiverse restricted';
+   sudo apt-get update -qq;
+   sudo apt-get install -y gcc-arm-none-eabi;
+   fi
+   - git fetch --all
 
 #make command
 script: "make all"