Prebuilding interface/ for windows-only builds

Author: evertonfraga

.gitignore

@@ -7,7 +7,6 @@ interface/.meteor/dev_bundle
 interface/.meteor/public/
 dist_wallet/
 dist_mist/
-build-interface/
 nodes/geth/
 config.json
 mist.log

appveyor.yml

@@ -53,7 +53,7 @@ install:
   - cd interface && yarn install
 
 build_script:
-  - ps: yarn build:$env:product --win 
+  - ps: yarn build:$env:product --win --skipTasks=build-interface
   - ps: yarn dist:$env:product
 
 test_script: