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

[Alexey Neyman]

Hi all,

The test for "-z combreloc" fails when cross-compiling on a machine
that uses BSD grep (e.g. on macos). grep complains about empty
subexpression and exits with non-zero status, which is interpreted
by configure as "not found". As a result, support for "-z combreloc"
(HAVE_Z_COMBRELOC) is not detected, leading to link failure on SPARC.

Trivial patch attached.

Regards,
Alexey.

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