pkg/54576: allow diagnostics in www/ap2-auth-mellon

[joern.clausen%uni-bielefeld.de@localhost]

>Number:         54576
>Category:       pkg
>Synopsis:       allow diagnostics in www/ap2-auth-mellon
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Sep 26 13:00:00 +0000 2019
>Originator:     Joern Clausen
>Release:        
>Organization:
Bielefeld University
>Environment:
>Description:
Using the directive "MellonDiagnosticsEnable On" results in a warning

MellonDiagnosticsEnable has no effect because Mellon was not compiled with diagnostics enabled, use ./configure --enable-diagnostics at build time to turn this feature on.

It would be nice to choose this feature via a pkgsrc option.
>How-To-Repeat:

>Fix: