[PATCH v3] configure.ac: Avoid empty subexpression in grep

[Alexey Neyman]

On 03/12/2017 12:50 AM, Paul Eggert wrote:
> Mike Frysinger wrote:
>> why not just use an ERE then ?
>>     if $READELF -S conftest.so | grep -E '\.rela?\.dyn' >/dev/null; then
>
> Sure, that works too.
>
>> replace all the /dev/null redirects with a -q flag.
>
> That also works.
>
Version 3 of the patch attached.

Regards,
Alexey.
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