reactor: un-static-ify make_pollfn()
reactor: un-static-ify make_pollfn()

make_pollfn() is a namespace-scope function, and so it should not be static,
or the compiler will duplicate it in every translation unit it is used.

Reviewed-by: Rafael Ávila de Espíndola <1975039f9046bf513b77c0c5639a0efc25f00e7f@scylladb.com>
Message-Id: <cb35edda9685e301a5041ae146b1062275f583a1@scylladb.com>

avikivity/seastar,cloudius-systems/seastar,syuu1228/seastar,dreamsxin/seastar,syuu1228/seastar,dreamsxin/seastar,cloudius-systems/seastar,syuu1228/seastar,scylladb/seastar,dreamsxin/seastar,scylladb/seastar,cloudius-systems/seastar,scylladb/seastar,avikivity/seastar,avikivity/seastar