Add postgis 2.4.0
doesn't remove v2.3.1. There are some big change in 2.4 that people may
don't want. see https://postgis.net/docs/release_notes.html#idm41021
fix test call
modify following recommandation of lsix
Fixes #15512 and #16032
With the multi output, postgresql cannot find at runtime what is its
basedir when looking for libdir and pkglibdir. This commit fixes that.