Update to 4.0.6.
Disable the RMAGIC option, it causes conflict with different versions of imagemagick. This problem is fixed in redmine 4.1, hopefully they'll backport the fix to the 4.0 branch.
Use the correct redmine version when building redmine plugins.

Mark www/redmine as deprecated with end of 2020Q2 to give maintainer enough time to upgrade everything to redmine4.
Redmine version 3 should not be included in 2020Q3 anymore.

PR: 244288
Submitted by: mikael@
Reported by: nork@ninth-nine.com
Reviewed by: mfechner@
Differential Revision: https://reviews.freebsd.org/D23682