MFH: r511397

security/openvpn: regression fix, support LibreSSL again.

(I use a different patch than what was submitted by pizzamig@,
and have sent our patch upstream.)

Remove IGNORE_SSL.

While here, remove USE_LDCONFIG to fix a portlint complaint,
and fix a typo in a Makefile comment.

PR: 238382
Reported by: pizzamig@

Since this does not change the default build, but fixes a broken
build in non-default configurations,
DEFAULT_VERSIONS+=ssl=libressl[-devel], and also fixes a regression
from OpenVPN 2.4.6, this should be good to crawl under the blanket.

Approved by: ports-secteam@ (blanket)