[PATCH build 1/2] List environment variables with usage.

[Gaetan Nadon]

On Sat, 2010-08-07 at 22:32 -0400, Trevor Woerner wrote:

> If help is requested using the build script, in addition to listing
> the
> build command-line options available, also display the list of
> environment
> variables which can be set which affect the build.
> 
> Signed-off-by: Trevor Woerner <twoerner at gmail.com>
> 

Reviewed-by: Gaetan Nadon <memsize at videotron.ca>
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