Fix build on FreeBSD for gsm

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@1747 65c4cc65-6c06-0410-ace0-fbb531ad65f3

Makefile

@@ -20,6 +20,10 @@ OSARCH=$(shell uname -s)
 
 ifeq (${OSARCH},Linux)
 PROC=$(shell uname -m)
+else
+ifeq (${OSARCH},FreeBSD)
+PROC=$(shell uname -m)
+endif
 endif
 # Pentium Pro Optimize
 #PROC=i686