Only run command line tests on windows

Author: liufengyun

.appveyor.yml

@@ -18,7 +18,7 @@ test_script:
   # - bash project/scripts/sbt test
   # - bash project/scripts/cmdTests
   # - bash project/scripts/sbt "dotty-bootstrapped/test"
-  - bash project/scripts/sbt "dotty-bootstrapped/testCompilation"
+  # - bash project/scripts/sbt "dotty-bootstrapped/testCompilation"
   - bash project/scripts/bootstrapCmdTests
 cache:
   - C:\sbt\