update ortp to fix conflict with gettimeofday defined both in ortp and

tunnel.
update documentation

README.mingw

@@ -65,10 +65,6 @@ WARNING: During the build, windows might slow down suddenly. Using ctl+alt+del t
  you might see a process 'LVpSRV.exe' or something like this that eats 90% of cpu.
 Kill it. Don't know what it is, but once killed, windows runs normally.
 
-#Compile and install tunnel (optional, available under proprietary licensing)
-
-cd tunnel && ./autogen.sh && ./configure --prefix=/usr --enable-shared --disable-static  && make && make install
-
 #Build linphone itself:
 #run autogen.sh after a git checkout or update
 

coreapi/misc.c

@@ -528,7 +528,7 @@ int linphone_core_run_stun_tests(LinphoneCore *lc, LinphoneCall *call){
 		}
 		got_audio=FALSE;
 		got_video=FALSE;
-		gettimeofday(&init,NULL);
+		ortp_gettimeofday(&init,NULL);
 		do{
 			
 			int id;
@@ -561,7 +561,7 @@ int linphone_core_run_stun_tests(LinphoneCore *lc, LinphoneCall *call){
 					cone_video=TRUE;
 				got_video=TRUE;
 			}
-			gettimeofday(&cur,NULL);
+			ortp_gettimeofday(&cur,NULL);
 			elapsed=((cur.tv_sec-init.tv_sec)*1000.0) +  ((cur.tv_usec-init.tv_usec)/1000.0);
 			if (elapsed>2000)  {
 				ms_message("Stun responses timeout, going ahead.");

oRTP @ b5d1414e

-Subproject commit 120e58e2c12d608ecb7a2f0c4ae91768cb1862a0
+Subproject commit b5d1414e63b21c83eb8e26988a3fe423ff8fc3b3