sed in CURRENT fails in textproc/jq

From: Yuri <yuri_at_FreeBSD.org>
Date: Sat, 09 Sep 2023 06:46:50 UTC
Either something has changed in sed(1) in CURRENT, or sed just fails 
during the configure stage of textproc/jq:

sed: No error: 0
checking for sys/cygwin.h... eval: ${+...}: Bad substitution


See the log: 
https://pkg-status.freebsd.org/beefy18/data/main-amd64-default/peb032111a352_s9c80d66ec1/logs/jq-1.7.log



Yuri