standards/49279: open_memstream missing

[justin%netbsd.org@localhost]

>Number:         49279
>Category:       standards
>Synopsis:       open_memstream missing
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    standards-manager
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Sun Oct 12 22:20:00 +0000 2014
>Originator:     Justin Cormack
>Release:        current
>Organization:
NetBSD
>Environment:
NetBSD rhombus.myriabit.eu 7.0_BETA NetBSD 7.0_BETA (GENERIC.201409131930Z) amd64

>Description:
open_memstream() missing from NetBSD, it is in POSIX.1-2008 see http://pubs.opengroup.org/onlinepubs/9699919799/functions/open_memstream.html

Someone worked on it once see http://mail-index.netbsd.org/tech-userlevel/2008/09/02/msg001133.html but apparently not committed and link not working.

FreeBSD, DragonflyBSD and OpenBSD all have support.
>How-To-Repeat:

>Fix: