Log Message:
nagios-plugins: Update to 2.4.3.

The distribution includes a broken NEWS file that refers to a non-existant
version 2.3.4, and a ChangeLog that has not been updated since 2020, so it is
assumed that the following changes are in this release, even though the version
number is wrong.  This update is primarily for the Solaris build fix.

2.3.4 ????-??-??
        pst3.c: Fix build issue on Solaris (#537)
        check_log: Fix error message for systems that don't use bash (#539)