Remove empty string setting from .xcconfig file

Author: jcmosc

Xcode/Configs/Shared.xcconfig

@@ -13,7 +13,6 @@ ALWAYS_SEARCH_USER_PATHS = NO
 
 CURRENT_PROJECT_VERSION = 1
 VERSIONING_SYSTEM = apple-generic
-VERSION_INFO_PREFIX = ""
 
 GCC_DYNAMIC_NO_PIC[config=Debug] = NO
 GCC_NO_COMMON_BLOCKS = YES