Rename build cache folder and separate sdk

Author: weltling

.appveyor.yml

@@ -17,13 +17,13 @@ skip_commits:
 clone_depth: 64
 
 cache:
-        - c:\build-cache
-        - c:\build-cache\sdk -> .appveyor.yml
+        - c:\build-cache2
+        - c:\build-cache2-sdk -> .appveyor.yml
 
 environment:
-        PHP_BUILD_CACHE_BASE_DIR: c:\build-cache  
+        PHP_BUILD_CACHE_BASE_DIR: c:\build-cache2
         PHP_BUILD_OBJ_DIR: c:\obj
-        PHP_BUILD_CACHE_SDK_DIR: c:\build-cache\sdk
+        PHP_BUILD_CACHE_SDK_DIR: c:\build-cache2-sdk
         PHP_BUILD_SDK_BRANCH: php-sdk-2.0.12beta3
         # ext and env setup for tests
         #MYSQL_TEST_PASSWD: Password12!