Get rid of MSVC's __int64

Use either int64_t, uint64_t or long long and unsigned long long, defined as per C++11 standard

Minecraft.World/FileInputStream.cpp

@@ -164,8 +164,8 @@ void FileInputStream::close()
 	{
 		//printf("\n\nFileInputStream::close - TRYING TO CLOSE AN INVALID FILE HANDLE\n\n");
 		return;
-	}	
-	
+	}
+
 	BOOL result = CloseHandle( m_fileHandle );
 
 	if( result == 0 )
@@ -185,7 +185,7 @@ void FileInputStream::close()
 //n - the number of bytes to be skipped.
 //Returns:
 //the actual number of bytes skipped.
-__int64 FileInputStream::skip(__int64 n)
+int64_t FileInputStream::skip(int64_t n)
 {
 #ifdef _XBOX
 	LARGE_INTEGER li;