Test availability of gperf in configure

Karl-Philipp Richter <[email protected]> Sat, 17 Nov 2018 22:55:15 +0100
Newsgroups gmane.comp.gnu.m4.general
Message-ID <[email protected]>
Hi,
If the `gperf` binary is unavailable the `m4` build process fails when
executing `make`. Since it's a prerequisite, it'd be more elegant and
intuitive to check the availability in `configure`.

-Kalle Richter
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