bootstrap failure with colons in objdir

[Benjamin Kosnik]

> Huh?  Quoting filenames in Makefile targets or dependencies?  No, this
> won't work.  Sorry if I'm out of context.

Hmm. I'm trying to figure out how to get Gerald's pathological build 
setup working again. This is the stuff like

blddir = /mnt/hd/gcc:20010730/bld

or something. Directory paths, not filenames, have to be able to deal 
with this. I thought quoting would help. Am I wrong? What would work?

-benjamin