[freeipa PR#5658][opened] configure: Make rpmlint optional

[stanislavlevin]

   URL: https://github.com/freeipa/freeipa/pull/5658
Author: stanislavlevin
 Title: #5658: configure: Make rpmlint optional
Action: opened

PR body:
"""
Distributions may want to run comprehensive fastcheck or lint tasks, but rpmlint tool is
mandatory for these targets while some platforms don't have it at all.

With this change the rpmlint becomes optional for fastcheck, devcheck and lint make
targets.

Note: rpmlint option is `disabled` by default.
To enable: `./configure --enable-rpmlint`
To explicitly disable: `./configure --disable-rpmlint`

Fixes: https://pagure.io/freeipa/issue/8768

"""

To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/5658/head:pr5658
git checkout pr5658