[readline] TUI size computation for mingw32 hosts

[Denis PILAT]

Attached is a patch that fix a problem of calculating console window size
when gdb is hosted on windows.

I already fixed this problem in gdb 6.4 version, that was integrated into
readline (cf 
http://sources.redhat.com/ml/gdb-patches/2006-02/msg00245.html)
, but the readline I got from the 6.5 version cancels the modification 
with some new
code that overwrote variables I used.


Denis
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