[committed] Fix check for darwin[0-7].* in configure.ac

[Andrew Pinski]

When Andreas Tobler "fixed" the testsuite time on darwin8, he also
broke the check for before 8 because he forgot that in configure.ac
you have to escape [ with another [; likewise for ].  This patches fixes
the problem.  Committed as preapproved by Tromey after a test on
powerpc-darwin7.

Thanks,
Andrew Pinski

ChangeLog:
	* configure.ac: Replace "*-*-darwin[0-7].*" with
	"*-*-darwin[[0-7]].*"
	* configure: Regenerate.

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