[BuildTools] Drive letters for Windows

[Lou Hafer]

Andreas, Kipp, JP,

	Kipp and I have been exchanging email about BuildTools, and this
business of drive letters has arisen as a problem in the Dylp build under Msys
(a problem locating the error message text file).  Now I see something similar
in the exchange with Matteo Fischetti related to cbc.

	I'm not enough of a Windows expert to know, so I'm asking: Is this a 
common problem that should be fixed down in BuildTools, or are we looking at 
separate problems that deserve separate fixes in cbc and dylp?
	
						Thanks,
							Lou