Reenable AppVeyor cache

Author: weltling

.appveyor.yml

@@ -16,9 +16,9 @@ skip_commits:
 
 clone_depth: 64
 
-#cache:
-#        - c:\build-cache
-#        - c:\build-cache\sdk -> .appveyor.yml
+cache:
+        - c:\build-cache
+        - c:\build-cache\sdk -> .appveyor.yml
 
 environment:
         PHP_BUILD_CACHE_BASE_DIR: c:\build-cache