[ci] disable non-cpp OS X because it doesn't work at the moment

.travis.yml

@@ -211,12 +211,12 @@ matrix:
     #######
     # osx #
     #######
-    - os: osx
-      osx_image: xcode6.4 # to compile binaries that support older versions of Mac
-      env:
-        - TEST=macro,neko,js,php,python,hl,lua
-        - DEPLOY_NIGHTLIES=1
-      install: *install_osx
+    # - os: osx
+    #   osx_image: xcode6.4 # to compile binaries that support older versions of Mac
+    #   env:
+    #     - TEST=macro,neko,js,php,python,hl,lua
+    #     - DEPLOY_NIGHTLIES=1
+    #   install: *install_osx
 
     - os: osx
       osx_image: xcode8.3 # to compile C++ faster