use IF_NAMESIZE instead of IFNAMSIZ to avoid warning

src/lib/ares__iface_ips.c

@@ -24,8 +24,7 @@
  * SPDX-License-Identifier: MIT
  */
 #include "ares_setup.h"
-#include "ares.h"
-#include "ares_private.h"
+
 
 #ifdef USE_WINSOCK
 #  include <winsock2.h>
@@ -57,9 +56,8 @@
 #  include <netinet/in.h>
 #endif
 
-#ifndef IFNAMSIZ
-#  define IFNAMSIZ 64
-#endif
+#include "ares.h"
+#include "ares_private.h"
 
 static ares_status_t ares__iface_ips_enumerate(ares__iface_ips_t *ips,
                                                const char        *name);
@@ -555,7 +553,7 @@ const char *ares__if_indextoname(unsigned int index, char *name,
                                  size_t name_len)
 {
 #ifdef HAVE_IF_INDEXTONAME
-  if (name_len < IFNAMSIZ) {
+  if (name_len < IF_NAMESIZE) {
     return NULL;
   }
   return if_indextoname(index, name);
@@ -565,7 +563,7 @@ const char *ares__if_indextoname(unsigned int index, char *name,
   size_t             i;
   const char        *ptr = NULL;
 
-  if (name_len < IFNAMSIZ) {
+  if (name_len < IF_NAMESIZE) {
     goto done;
   }
 

src/lib/ares__iface_ips.h

@@ -130,7 +130,7 @@ unsigned int  ares__if_nametoindex(const char *name);
  *
  * \param[in] index  Interface index (> 0)
  * \param[in] name   Buffer to hold name
- * \param[in] name_len Length of provided buffer, must be at least IFNAMSIZ
+ * \param[in] name_len Length of provided buffer, must be at least IF_NAMESIZE
  * \return NULL on failure, or pointer to name on success
  */
 const char   *ares__if_indextoname(unsigned int index, char *name,

src/lib/ares_update_servers.c

@@ -54,16 +54,12 @@
 #include "ares_inet_net_pton.h"
 #include "ares_private.h"
 
-#ifndef IFNAMSIZ
-#  define IFNAMSIZ 64
-#endif
-
 typedef struct {
   struct ares_addr addr;
   unsigned short   tcp_port;
   unsigned short   udp_port;
 
-  char             ll_iface[IFNAMSIZ];
+  char             ll_iface[IF_NAMESIZE];
   unsigned int     ll_scope;
 } ares_sconfig_t;
 
@@ -351,7 +347,7 @@ static ares_status_t ares__sconfig_linklocal(ares_sconfig_t *s,
   unsigned int ll_scope = 0;
 
   if (ares_str_isnum(ll_iface)) {
-    char ifname[IFNAMSIZ] = "";
+    char ifname[IF_NAMESIZE] = "";
     ll_scope                 = (unsigned int)atoi(ll_iface);
     if (ares__if_indextoname(ll_scope, ifname, sizeof(ifname)) == NULL) {
       DEBUGF(fprintf(stderr, "Interface %s for ipv6 Link Local not found\n",