[12/17] cmd.exe: Add working directory per drive

[Ann & Jason Edmeades]

E.g. 
C:
Cd program files
z:
c:
You will not be in program files any longer...

This is how windows does it, using internal variables - See the MSDN
documentation for CreateProcess and this old wine reference:
	http://www.winehq.org/pipermail/wine-devel/2003-July/018833.html

Note I have only made cmd.exe support these new env vars, whereas the wine
reference implies testing shows some API calls check them as well.
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