mingw's windres

[Eric Pouech]

Juan reported some issues in (unix) console handling with windres
it turns out that windres tries to run gcc (as a preprocessor), but thru the 
interpreter defined in COMSPEC, and passing the input / output streams in 
msvcrt's handles' inheritance block
As in Wine COMSPEC points to wcmd, wcmd wasn't correctly passing those streams 
to gcc as wcmd isn't using the msvcrt (hence, not it's handles's inheritance block)
to work around this, this patch adds the ability, when wcmd's parent passes a 
handles' inheritance block to wcmd, to reuse that block for any child that wcmd 
creates (the details are a bit more complicated, as wcmd can override the 
streams, like when invoked with "wcmd /c foo > bar").

A+
-- 
Eric Pouech
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