FIX: games/pacman-arena -fno-common

[Brian Callahan]

Hi ports --

Attached is a diff to fix games/pacman-arena with -fno-common.
It is taken from Gentoo: https://github.com/gentoo/gentoo/pull/17532

Game still works on amd64.

OK?

~Brian

pacman-arena-nocommon.diff
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