add iLBC optimizations from bkw

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@2982 65c4cc65-6c06-0410-ace0-fbb531ad65f3

codecs/ilbc/Makefile

-CFLAGS+= -fPIC -O3
+CFLAGS+=-Wall -Werror -fPIC -O3 -march=$(shell uname -m) -funroll-loops -fomit-frame-pointer
 LIB=libilbc.a
 
 OBJS= anaFilter.o iCBSearch.o packing.o \