patch to optionally relax paren expression handling

[Alan Modra]

On Fri, 23 Jun 2000, matthew green wrote:

> 2000-06-23  matthew green  <mrg@redhat.com>
> 
>         * expr.c (operand): Do not as_bad() if RELAX_PAREN_GROUPING is
> 	defined.  Fix error message for `[' grouping.

Committed.  Thanks for fixing the double increment of input_line_pointer
too.

Regards, Alan Modra
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