remove a duplicate prototype

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@26847 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -1173,7 +1173,6 @@ static int find_sip_method(const char *msg);
 static unsigned int parse_sip_options(struct sip_pvt *pvt, const char *supported);
 static void parse_request(struct sip_request *req);
 static const char *get_header(const struct sip_request *req, const char *name);
-static void copy_request(struct sip_request *dst,struct sip_request *src);
 static char *referstatus2str(enum referstatus rstatus);
 static int method_match(enum sipmethod id, const char *name);
 static void parse_copy(struct sip_request *dst, struct sip_request *src);