I don't think you can target MSVCRT specifically - the MS Visual C++ runtime changes with each version of visual studio, you MUST target the correct one. If you are concerned that clients will not have the library, you must provide the Visual C++ Redistributables with your installer or release:
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=29[
^]
Don't try to fudge a link to the older version - you'll get exceptions and crashes.