pkg/53792: SIGSEGV while building lang/npm with lang/nodejs

[nia%netbsd.org@localhost]

>Number:         53792
>Category:       pkg
>Synopsis:       SIGSEGV while building lang/npm with lang/nodejs
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Dec 16 14:00:00 +0000 2018
>Originator:     nia
>Release:        NetBSD -current, pkgsrc -current
>Organization:
>Environment:
>Description:
node.core is an empty file. This happens regardless of whether MPROTECT is enabled.

pkgsrc-users thread: https://mail-index.netbsd.org/pkgsrc-users/2018/10/16/msg027550.html

I was pointed to this thread after noticing the problem and posting about it in #pkgsrc, so apparently I'm not the only one. npm package also seems to be missing from bulk builds going as far back as I can find.

yarn also segfaults when it's actually used with node.js 10.
>How-To-Repeat:
Attempt to build lang/npm.
>Fix:
Use lang/nodejs8 instead.