Fix modern gcc warning: argument to 'sizeof' in 'strncpy' call is the same expression as the source

Silence warning about using src to determine number of bytes to copy.
In this case it doesn't matter whether it is `src` or `dest`. So there
is no functionality change.

Bug: #210 
Fix By: @flyingdutchman23

ares_init.c

@@ -299,7 +299,7 @@ int ares_dup(ares_channel *dest, ares_channel src)
   (*dest)->sock_func_cb_data   = src->sock_func_cb_data;
 
   strncpy((*dest)->local_dev_name, src->local_dev_name,
-          sizeof(src->local_dev_name));
+          sizeof((*dest)->local_dev_name));
   (*dest)->local_ip4 = src->local_ip4;
   memcpy((*dest)->local_ip6, src->local_ip6, sizeof(src->local_ip6));
 
@@ -1180,7 +1180,7 @@ static int get_DNS_AdaptersAddresses(char **outptr)
         /* Allocate room for another address, if necessary, else skip. */
         if(addressesIndex == addressesSize) {
           const size_t newSize = addressesSize + 4;
-          Address * const newMem = 
+          Address * const newMem =
             (Address*)ares_realloc(addresses, sizeof(Address) * newSize);
           if(newMem == NULL) {
             continue;
@@ -1237,7 +1237,7 @@ static int get_DNS_AdaptersAddresses(char **outptr)
           /* Save the address as the next element in addresses. */
           addresses[addressesIndex].metric =
             getBestRouteMetric(&ipaaEntry->Luid,
-                               (SOCKADDR_INET*)(namesrvr.sa), 
+                               (SOCKADDR_INET*)(namesrvr.sa),
                                ipaaEntry->Ipv6Metric);
         }
         else
@@ -1287,7 +1287,7 @@ static int get_DNS_AdaptersAddresses(char **outptr)
 
 done:
   ares_free(addresses);
-  
+
   if (ipaa)
     ares_free(ipaa);
 
@@ -1391,7 +1391,7 @@ static size_t next_suffix(const char** list, const size_t advance)
  *
  * Returns 1 and sets *outptr when returning a dynamically allocated string.
  *
- * Implementation supports Windows Server 2003 and newer 
+ * Implementation supports Windows Server 2003 and newer
  */
 static int get_SuffixList_Windows(char **outptr)
 {