MacOS X compat: Don't process vars.el.in with sed.
At least on MacOS X, sed fails with "sed: RE error: illegal byte sequence" if LC_CTYPE is set to an UTF-8 encoding, probably due to the Latin-1 characters in the definition of lyskom-mule-compiled. Since the substitution of the version number was the only reason to process vars.el.in, stop doing so to avoid this problem. Thanks to Calle Dybedahl for reporting this problem.
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