C:\Qt\2010.01\bin\sqldrivers\mysql is not the correct path. This path is a bin directory for QtCreator files and has nothing to do with Qt Libraries your are using for your applications. Especially bin directory is not the right place to search sources to compile as its name stands from "binary" so already compiled stuff.
C:\Qt\2010.01\qt <- your Qt dir
C:\Qt\2010.01\qt\src\plugins\sqldrivers\mysql <- your MySQL plugin sources ("src" stands for "sources")