At least Fedora 28 glibc-2.27-8.fc28 no longer provides the nis development
headers and libraries. (It only still contains some binaries for backwards
compatibility, in the libnsl sub-package: "This package provides the legacy
version of libnsl library, for accessing NIS services.")

The -lnsl was present ever since 4946c62f
"mysqlconnector: initial import from CWS mysqlnative", but appears to not be
necessary (at least any more).

Change-Id: I10b56cdc1a438fb2978125ae0acde0dbec747e78
Reviewed-on: https://gerrit.libreoffice.org/52536Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>
Tested-by: Jenkins <ci@libreoffice.org>