remove CI from OS X build

.travis.yml

@@ -19,14 +19,13 @@ matrix:
     osx_image: xcode8.1
 
 before_install:
-  - if test ${TRAVIS_OS_NAME} = "osx"; then sudo brew install ant; fi
   - if test ${TRAVIS_OS_NAME} = "linux"; then sudo apt-get install -y libewf-dev; fi
 
-
 install:
   - if test ${TRAVIS_OS_NAME} = "linux"; then sudo apt-get install -y libcppunit-dev; fi
   - ./bootstrap
 
 script:
   - ./configure && make && make check
-  - cd release; ./release-unix.pl ci
+  - f test ${TRAVIS_OS_NAME} = "linux"; cd release; ./release-unix.pl ci; fi
+# NOTE: OS X doesn't have ant, so CI fails