[RFA/commit] Work around Solaris bourne shell limitation when building the sim

[Joel Brobecker]

> > sim/common/ChangeLog:
> > 
> >         * Make-common.in (hw-config.h): Work around bug in Solaris 2.8
> >         system bourne shell.
> 
> LGTM

Thank you. Checked in, HEAD + 7.4.

-- 
Joel