option.c: use rb_w32_inet_pton

* ext/socket/option.c (inet_pton): use rb_w32_inet_pton, instead of
  inet_ntop directly, which is unavailable on older version Windows.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45151 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,4 +1,7 @@
-Sun Feb 23 11:54:02 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Sun Feb 23 12:18:54 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/socket/option.c (inet_pton): use rb_w32_inet_pton, instead of
+	  inet_ntop directly, which is unavailable on older version Windows.
 
 	* include/ruby/win32.h, win32/win32.c (rb_w32_inet_pton): add a
 	  wrapper function for inet_pton minimum supported client is

ext/socket/raddrinfo.c

@@ -177,6 +177,10 @@ numeric_getaddrinfo(const char *node, const char *service,
         struct addrinfo **res)
 {
 #ifdef HAVE_INET_PTON
+# if defined __MINGW64__
+#   define inet_pton(f,s,d)        rb_w32_inet_pton(f,s,d)
+# endif
+
     if (node && (!service || strspn(service, "0123456789") == strlen(service))) {
 	static const struct {
 	    int socktype;