Update config/ax_pthread.m4 to latest upstream version.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: df303aff6601a893cf83c26ffd6c7eb5fb6b067e
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-11-19T20:05:33Z
Releases: 12.0
Update config/ax_pthread.m4 to latest upstream version.

This change doesn't fix any bugs that we've heard about, but it seems
like a good idea on general principles to track upstream occasionally.

Discussion: https://postgr.es/m/3320.1542647565@sss.pgh.pa.us

Files

PathChange+/−
config/ax_pthread.m4 modified +211 −100
configure modified +305 −106

Discussion