lang/crystal: fix broken base SSL usage

crystal needs pkgconfig to determine precisely which SSL variant is
present, and patch itself accordingly, but this is not present in
FreeBSD base. Patch directly, what would have been provided by
pkgconfig, for currently supported FreeBSD versions.

PR: 257658
Approved by: greg@unrelenting.technology (maintainer)
Differential Revision: https://reviews.freebsd.org/D31435