Fix textproc/halibut -fno-common

[Brian Callahan]

Hello ports --

Attached is a diff to fix textproc/halibut with -fno-common.
It is taken from Debian:
https://sources.debian.org/data/main/h/halibut/1.2-3/debian/patches/gcc-no-common.patch

OK?

~Brian

halibut-nocommon.diff
Description: Binary data