Update OSX environment to Sierra
as homebrew seems to have dropped support for El Capitan in their gcc packages
@@ -149,7 +149,7 @@ matrix:
- &test-macos
os: osx
- osx_image: xcode8
+ osx_image: xcode8.3
before_script:
- COMMON_FLAGS="DYNAMIC_ARCH=1 TARGET=NEHALEM NUM_THREADS=32"
- brew update
