www/mod_authnz_crowd: Deprecate and set expiration date to 2022-03-31

Abandoned upstream in 2014, doesn't work with Apache 2.4+

Reference: https://community.atlassian.com/t5/Crowd-questions/Apache-2-4-mod-authnz-crowd-not-working/qaq-p/655874

Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D32393