Only include include files once (imported from 1.4)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@49004 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -113,7 +113,6 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 #include "asterisk/module.h"
 #include "asterisk/pbx.h"
 #include "asterisk/options.h"
-#include "asterisk/lock.h"
 #include "asterisk/sched.h"
 #include "asterisk/io.h"
 #include "asterisk/rtp.h"
@@ -126,7 +125,6 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 #include "asterisk/musiconhold.h"
 #include "asterisk/dsp.h"
 #include "asterisk/features.h"
-#include "asterisk/acl.h"
 #include "asterisk/srv.h"
 #include "asterisk/astdb.h"
 #include "asterisk/causes.h"