#53 add non-default, non-win compiler for windows/config

Likely_soon
open
3
2013-01-09
2004-01-16
R. Clint Whaley
No

Config assumes that any non-default (i.e., given on the
command line) compiler is a windows style compiler
(taking the wrong slash for path, using the slash
instead of - for flags, etc). Need to add a way for
the user to override this behavior to say that the
indicated compiler is unix-style.

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