[patch] getenv spec function

[Nathan Sidwell]

I've installed this obvious patch to fix the getenv spec function.  The result 
of spec functions is itself parsed as a spec.  But that means that reading a 
variable holding a windows path, strips out all the '\' and, if some one is 
insane enough to have '%' in a directory name, really bad things will happen.

tested on i686-linux-gnu.

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::         CodeSourcery

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