Andrés García fixed a warning in the ioctlsocket() usage.

acinclude.m4

@@ -64,7 +64,7 @@ dnl the code was bad, try a different program now, test 3
 ],[
 /* ioctlsocket source code */
  int socket;
- int flags = ioctlsocket(socket, FIONBIO, &flags);
+ unsigned long flags = ioctlsocket(socket, FIONBIO, &flags);
 ],[
 dnl ioctlsocket test was good
 nonblock="ioctlsocket"

lib/connect.c

@@ -147,7 +147,7 @@ int Curl_nonblock(curl_socket_t sockfd,    /* operate on this */
 
 #ifdef HAVE_IOCTLSOCKET
   /* Windows? */
-  int flags;
+  unsigned long flags;
   flags = nonblock;
   return ioctlsocket(sockfd, FIONBIO, &flags);
 #define SETBLOCK 3