urlapi: remove an unnecessary call to strlen

- Use strcpy instead of strlen+memcpy to copy the url path.

Ref: https://curl.se/mail/lib-2022-02/0006.html

Closes https://github.com/curl/curl/pull/8370

lib/urlapi.c

@@ -1005,9 +1005,7 @@ static CURLUcode seturl(const char *url, CURLU *u, unsigned int flags)
         return CURLUE_NO_HOST;
     }
 
-    len = strlen(p);
-    memcpy(path, p, len);
-    path[len] = 0;
+    strcpy(path, p);
 
     if(schemep) {
       u->scheme = strdup(schemep);