UWP: Update to build with Windows SDK 10.16229.0

- Update the OpenSSL shim to work with the new SDK
- Change the ARM platform detection to work with VS2017

thirdparty/openssl/uwp.cpp

@@ -103,12 +103,14 @@ extern "C"
 		{
 		return 0;
 		}
+#ifndef STD_ERROR_HANDLE
 	int __cdecl GetStdHandle(
 						   _In_  DWORD nStdHandle
 						   )
 		{
 		return 0;
 		}
+#endif
 	BOOL DeregisterEventSource(
 							  _Inout_  HANDLE hEventLog
 							  )