[PATCH] Update build procedure in setup README

[Eric Blake]

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According to Dave Korn on 7/22/2009 2:34 PM:
>   Makes sense to everyone?  (CC_FOR_BUILD defaults to just 'cc' if you don't
> set it; it's utterly non-critical which version of GCC is used, however, so I
> didn't bother to add a version suffix to that one.)

> +       --build=i686-pc-cygwin CC="gcc-3 -mno-cygwin" CXX="g++-3 -mno-cygwin" \

gcc-3, or gcc-4?

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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