This fixes the following issue:
Summary:
/usr/bin/ld: general.o:/opt/darkbot/build/./../source/prototypes.h:132: multiple definition of `alarmed'; chan.o:/opt/darkbot/build/./../source/prototypes.h:132: first defined here
Ref T1646.
Test Plan: Compile under FreeBSD with LLVM, Cygwin and Debian with gcc
Reviewers: dereckson
Maniphest Tasks: T1646
Differential Revision: https://devcentral.nasqueron.org/D2396