Fix build on FreeBSD/aarch64

[valpackett]

flb_libco needs a little fix to build on FreeBSD/aarch64: edsiper/flb_libco#8

[github-actions]

This issue is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 5 days. Maintainers can add the exempt-stale label.

[github-actions]

This issue was closed because it has been stalled for 5 days with no activity.