toolchain/47019: Todo: check build knobs MKEXTSRC, MKARZERO, MKMANDOC

[jkoshy%NetBSD.org@localhost]

>Number:         47019
>Category:       toolchain
>Synopsis:       Todo: check build knobs MKEXTSRC, MKARZERO, MKMANDOC
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    toolchain-manager
>State:          open
>Class:          doc-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Sep 30 06:00:01 +0000 2012
>Originator:     Joseph Koshy
>Release:        NetBSD -current
>Organization:
The NetBSD Project
>Environment:
>Description:
The following build knobs mentioned in share/mk/bsd.README need to be checked 
for validity, and either documented, marked as obsolete or removed:

EXTSRCSRCDIR and MKEXTSRC -- build external sources
MKARZERO -- implementation detail for MKREPRO
MKMANDOC -- build manual pages with mandoc(1)

>How-To-Repeat:

>Fix: