Swapped afxres.h include for windows.h

I'm running an Express Edition of MSVC, so don't have the former, and
the Internet says that windows.h is a suitable substitute in this case.
Addition to 87fed687c35c8e93361123507d696027a9aa781f

Need to change another reference to afxres.h so when the file is edited with
the resource editor in Visual Studio, it isn't regenerated with afxres.h
included.

See:
http://stackoverflow.com/questions/1575559/do-i-need-afxres-h-if-i-am-not-using-mfc-how-do-i-remove-it-from-the-rc-scrip

shipr's comment on Cheeso's answer