gccgo branch and darwin

[Ian Lance Taylor]

Ralf Wildenhues <Ralf.Wildenhues@gmx.de> writes:

> Good catch.  Alternation is not portable in sed, but nested grouping
> \(\(...\)...\) is not fully portable either, neither is \U.
> There are a few instances of those in this file.

Thanks for pointing this out.  This patch fixes mksysinfo.sh to avoid
this unportable constructs.  Committed to gccgo branch.

Ian

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