travis,osx: use xcode8 image for gcc-4.9 availability
@@ -78,6 +78,7 @@ matrix:
# OSX Debug, GCC 4.9
- os: osx
+ osx_image: xcode8
compiler: gcc-4.9
env:
- CONFIGURATION=Debug
@@ -86,6 +87,7 @@ matrix:
# OSX RelWithDebInfo, GCC 4.9
- os: osx
+ osx_image: xcode8
compiler: gcc-4.9
env: CONFIGURATION=RelWithDebInfo
