pkg/53934: shells/fish could use a `doc' option to make building documentation with doxygen optional

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>Number:         53934
>Category:       pkg
>Synopsis:       shells/fish could use a `doc' option to make building documentation with doxygen optional
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Feb 03 03:15:00 +0000 2019
>Originator:     Dean Matzkov
>Release:        pkgsrc-2018Q4 and trunk
>Organization:
>Environment:
>Description:
Right now shells/fish requires devel/doxygen as a BUILD_DEPEND, and thus pulls in a lot of other dependencies (e.g. perl, python, graphviz, ghostscript, etc.) that all take quite a while to build, especially on slower platform. And from my experiences, these dependencies tend to hit build errors on other platforms such as Linux or macOS.

It'd be nice if there was a `doc' flag to make pulling-in doxygen and friends optional, since most users probably don't want to wait for all of that stuff when they just want to start using their preferred shell.

Thanks!
>How-To-Repeat:

>Fix: