B"H view1090: sleep a bit between loops

view1090 was using close to 100% CPU before, with the non-blocking
commits and the reconnection code. sleep a bit between loop iterations
to keep CPU usage low.

CPU usage with this addition was down to <1% in testing.

view1090.c

@@ -291,6 +291,7 @@ int main(int argc, char **argv) {
 			continue;
         }
         modesReadFromClient(c,"",decodeBinMessage);
+		usleep(100000);
     }
 
     // The user has stopped us, so close any socket we opened