databases/ladybug: fix build on armv7
Same polyfill as the one for textproc/krep.
See also: a002d848b52bda537a6d0a90da4616001303f80b
Approved by: portmgr (build fix blanket)
MFH: 2026Q3
(cherry picked from commit b811b996cbf6d3688b451868d464489fd6e923df)