www/freenginx-devel: update: 1.31.1 -> 1.31.2

Sponsored by: tipi.work

<ChangeLog>

*) Bugfix: a segmentation fault might occur in a worker process if

nested captures were used in the "rewrite" directive.

*) Bugfix: the "if" directive incorrectly handled relative paths when

checking files.

</ChangeLog>