archivers/openzl: not for 32-bit platforms

32-bit platforms are not yet supported.
Upstream is working on it.

See also: https://github.com/facebook/openzl/issues/342
Approved by: portmgr (build fix blanket)
MFH: 2026Q2

(cherry picked from commit 4825563a6b539122b507db7cfbcc356cce5ba1fb)