This is needed to address build failures after upgrade to boost.

I'm not particularly familiar with arrow nor boost, but it does at least compile

• tested on CURRENT amd64 only so far

https://pkg.skunkwerks.at/poudriere/data/current_x64-default/2025-06-09_20h06m10s/logs/arrow-20.0.0.log

see https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287404