www/rubygem-passenger: Fix build on 15-CURRENT
Reference: https://pkg-status.freebsd.org/beefy17/data/main-i386-default/pa24f68e859d8_s78935fa40ee/logs/rubygem-passenger-nginx-6.0.27.log
Obtained from: devel/libev/files/patch-ev.c
(cherry picked from commit 26914af758edf9ba27a782664da60e5998eb4074)