mgw: accept zero-length RTP payload as BFI Mainline OsmoBTS now has an option (rtp continuous-streaming) that causes it to emit an RTP packet every 20 ms without gaps, sending a BFI marker in the form of zero-length RTP payload when it has nothing else to send. These codec-independent BFI markers don't indicate TAF, but this provision is a good start. Accept this BFI packet format in themwi-mgw.

CC=	gcc
CFLAGS=	-O2
OBJS=	get_header.o grok_from.o out_msg.o primary_parse.o req_supp.o \
	resp_ident.o sdp_gen.o sdp_parse.o to_tag.o uas_basic.o uri_utils.o
LIB=	libsip.a

all:	${LIB}

${LIB}:	${OBJS}
	ar rcu $@ ${OBJS}
	ranlib $@

clean:
	rm -f *.[oa] errs