Unset CPATH env variable in Travis

Author: kylefleming

.travis.yml

@@ -4,6 +4,8 @@ cache:
 - cocoapods
 - bundler
 gemfile: test/Gemfile
+before_install:
+- unset CPATH
 install:
 - bundle install --jobs=3 --retry=3 --path=${BUNDLE_PATH:-vendor/bundle}
 - bundle exec pod setup