Insecure use of strcpy allowed for potential buffer overflow vulnerabili...

...ties.

Several of these changes have been replaced with the more secure strncpy. Due to the Contiki being the largest IoT platform, security should be a primary concerned.
Again you are looking at the size of the pointer not the buffer. In this case actually it is not necessary to replace `strcpy` as the length assessment is correctly checked in [line 934](https://github.com/jaredestroud/contiki/blob/master/apps/webbrowser/www.c#L934) by this `if`

```C
if(query - url + WWW_CONF_MAX_URLLEN - 1 /* delimiter */ < length) {
    return;
}
```