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H A DMakefiled058698fd2d9f769ff38ac53c8708b3fdd314f2d Fri Feb 15 02:44:42 UTC 2008 Kumar Gala <galak@kernel.crashing.org> Add setexpr command

Add a simple expr style command that will set an env variable as the result
of the command. This allows us to do simple math in shell. The following
operations are supported: &, |, ^, +, -, *, /.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>