Try fixing Mac build with 10.12

Related
https://github.com/harfbuzz/harfbuzz/issues/345
https://github.com/harfbuzz/harfbuzz/pull/629

.travis.yml

@@ -18,6 +18,7 @@ install:
   - if [ "$TRAVIS_OS_NAME" == "linux" ]; then pip install --user nose; fi
   - if [ "$TRAVIS_OS_NAME" == "linux" ]; then pip install --user cpp-coveralls; fi # for coveralls.io code coverage tracking
   - if [ "$TRAVIS_OS_NAME" == "linux" ]; then export PATH=$HOME/.local/bin:$PATH; fi # Make sure we can find the above Python packages
+  - if [ "$TRAVIS_OS_NAME" == "osx" ]; then export CXXFLAGS="$CXXFLAGS -Wno-deprecated-declarations"; fi; # https://github.com/harfbuzz/harfbuzz/issues/345
   - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew update; fi;
   - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew uninstall libtool && brew install libtool; fi # Workaround Travis/brew bug
   - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew install ragel freetype glib gobject-introspection cairo icu4c graphite2; fi