Remove command checks in tests of pg_basebackup and pg_receivewal

Michael Paquier <michael@paquier.xyz>

Commit: a4e1deb42b378650aaa2bcb3897caad9fe895957
Author: Michael Paquier <michael@paquier.xyz>
Date: 2022-02-15T04:41:40Z
Releases: 15.0
Remove command checks in tests of pg_basebackup and pg_receivewal

The TAP tests of those commands have been checking if commands of "gzip"
and "lz4" existed by launching them with an extra --version.  Based on
the buildfarm, this is not required for "gzip" as the command always
exists.  Since 1d084fb, "lz4" has a ./configure check doing the same
thing.

Reported-by: Andres Freund
Discussion: https://postgr.es/m/20220212220643.ozuvq2k4cjkcnr2v@alap3.anarazel.de
Discussion: https://postgr.es/m/Ygm2ADakjlqGc2Ro@paquier.xyz

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