(ITS#8928) Reproducibility: Remove user, hostname, pwd from version string

[douglas.royds@taitradio.com]

Full_Name: Douglas Royds
Version: HEAD
OS: Ubuntu 16.04
URL: ftp://ftp.openldap.org/incoming/douglas-royds-181017.patch
Submission from: (NULL) (202.37.96.2)


To achieve binary-reproducible builds across different build hosts, build paths,
and users, we need to set the WHOWHERE value with something fixed. In this patch
I set it to the SOURCE_DATE_EPOCH if set (see
https://reproducible-builds.org/specs/source-date-epoch/). If you're not trying
to do a reproducible build, it won't be set, so the existing WHOWHERE string
will apply.

Debian have set this string to their own Debian-specific value:

    https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=833179

    WHOWHERE="$(dpkg-vendor --query vendor) package version
$(dpkg-parsechangelog -SVersion)"

Tait Communications Ltd hereby place the following modifications to OpenLDAP
Software (and only these modifications) into the public domain. Hence, these
modifications may be freely used and/or redistributed for any purpose with or
without attribution and/or other notice.