Disable broken arm64 builds

.travis.yml

@@ -6,9 +6,10 @@ matrix:
     - os: linux
       sudo: required
       env: BUILDARCH=ia32
-    - os: linux
-      sudo: required
-      env: BUILDARCH=arm64
+# arm64 builds don't work yet
+#    - os: linux
+#      sudo: required
+#      env: BUILDARCH=arm64
     - os: osx
 
 language: node_js