create __if_nametoindex hidden alias and use it

libc/inet/getaddrinfo.c

@@ -51,6 +51,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define inet_pton __inet_pton
 #define inet_ntop __inet_ntop
 #define strtoul __strtoul
+#define if_nametoindex __if_nametoindex
 #if 0
 #define uname __uname
 #define stpcpy __stpcpy

libc/inet/if_index.c

@@ -65,6 +65,7 @@ if_nametoindex(const char* ifname)
   return ifr.ifr_ifindex;
 #endif
 }
+hidden_strong_alias(if_nametoindex,__if_nametoindex)
 
 void
 if_freenameindex (struct if_nameindex *ifn)