Android: Drop redundant setting of CMP0057 in Android-Determine

A module-wide setting was added by commit 8ede3552 (IN_LIST: Ensure
policy allows if(IN_LIST) if used by a module, 2018-09-12,
v3.13.0-rc1~95^2), so our local setting is no longer needed.

Modules/Platform/Android-Determine.cmake

@@ -320,15 +320,12 @@ if(NOT CMAKE_ANDROID_ARCH_ABI)
     # Choose the oldest among the available arm ABIs.
     if(_ANDROID_ABIS)
       list(REMOVE_DUPLICATES _ANDROID_ABIS)
-      cmake_policy(PUSH)
-      cmake_policy(SET CMP0057 NEW)
       foreach(abi armeabi armeabi-v7a arm64-v8a)
         if("${abi}" IN_LIST _ANDROID_ABIS)
           set(CMAKE_ANDROID_ARCH_ABI "${abi}")
           break()
         endif()
       endforeach()
-      cmake_policy(POP)
     endif()
     unset(_ANDROID_ABIS)