Use portable inet_pton() for all Win32 builds.

Rename the portable inet_pton() to xp_inet_pton() and define a wrapper macro (for all Widows builds) to use it instead of inet_pton() as not all supported Windows systems (e.g. WinXP) have an inet_pton() implementation.

This allows the HAProxy mod to be re-enabled by default without preventing executing on WinXP.

src/xpdev/sockwrap.c

-/* sockwrap.c */
-
 /* Berkley/WinSock socket API wrappers */
 
-/* $Id: sockwrap.c,v 1.74 2020/08/09 02:13:57 rswindell Exp $ */
-
 /****************************************************************************
  * @format.tab-size 4		(Plain Text/Source Code File Header)			*
  * @format.use-tabs true	(see http://www.synchro.net/ptsc_hdr.html)		*
  *																			*
  * Copyright Rob Swindell - http://www.synchro.net/copyright.html			*
  *																			*
- * This library is free software; you can redistribute it and/or			*
- * modify it under the terms of the GNU Lesser General Public License		*
+ * This program is free software; you can redistribute it and/or			*
+ * modify it under the terms of the GNU General Public License				*
  * as published by the Free Software Foundation; either version 2			*
  * of the License, or (at your option) any later version.					*
- * See the GNU Lesser General Public License for more details: lgpl.txt or	*
- * http://www.fsf.org/copyleft/lesser.html									*
- *																			*
- * Anonymous FTP access to the most recent released source is available at	*
- * ftp://vert.synchro.net, ftp://cvs.synchro.net and ftp://ftp.synchro.net	*
- *																			*
- * Anonymous CVS access to the development source and modification history	*
- * is available at cvs.synchro.net:/cvsroot/sbbs, example:					*
- * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs login			*
- *     (just hit return, no password is necessary)							*
- * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs checkout src		*
+ * See the GNU General Public License for more details: gpl.txt or			*
+ * http://www.fsf.org/copyleft/gpl.html										*
  *																			*
  * For Synchronet coding style and modification guidelines, see				*
  * http://www.synchro.net/source.html										*
  *																			*
- * You are encouraged to submit any modifications (preferably in Unix diff	*
- * format) via e-mail to mods@synchro.net									*
- *																			*
  * Note: If this box doesn't appear square, then you need to fix your tabs.	*
  ****************************************************************************/
 
@@ -524,8 +508,7 @@ DLLEXPORT char* socket_strerror(int error_number, char* buf, size_t buflen)
 #endif
 }
 
-#if defined(_WIN32) && !defined(_MSC_VER)
-DLLEXPORT int inet_pton(int af, const char *src, void *dst)
+DLLEXPORT int xp_inet_pton(int af, const char *src, void *dst)
 {
 	struct addrinfo hints = {0};
 	struct addrinfo *res, *cur;
@@ -558,4 +541,3 @@ DLLEXPORT int inet_pton(int af, const char *src, void *dst)
 	freeaddrinfo(res);
 	return 1;
 }
-#endif

src/xpdev/sockwrap.h

-/* sockwrap.h */
-
 /* Berkley/WinSock socket API wrappers */
 
-/* $Id: sockwrap.h,v 1.61 2020/08/08 23:26:38 rswindell Exp $ */
-
 /****************************************************************************
  * @format.tab-size 4		(Plain Text/Source Code File Header)			*
  * @format.use-tabs true	(see http://www.synchro.net/ptsc_hdr.html)		*
  *																			*
  * Copyright Rob Swindell - http://www.synchro.net/copyright.html			*
  *																			*
- * This library is free software; you can redistribute it and/or			*
- * modify it under the terms of the GNU Lesser General Public License		*
+ * This program is free software; you can redistribute it and/or			*
+ * modify it under the terms of the GNU General Public License				*
  * as published by the Free Software Foundation; either version 2			*
  * of the License, or (at your option) any later version.					*
- * See the GNU Lesser General Public License for more details: lgpl.txt or	*
- * http://www.fsf.org/copyleft/lesser.html									*
- *																			*
- * Anonymous FTP access to the most recent released source is available at	*
- * ftp://vert.synchro.net, ftp://cvs.synchro.net and ftp://ftp.synchro.net	*
- *																			*
- * Anonymous CVS access to the development source and modification history	*
- * is available at cvs.synchro.net:/cvsroot/sbbs, example:					*
- * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs login			*
- *     (just hit return, no password is necessary)							*
- * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs checkout src		*
+ * See the GNU General Public License for more details: gpl.txt or			*
+ * http://www.fsf.org/copyleft/gpl.html										*
  *																			*
  * For Synchronet coding style and modification guidelines, see				*
  * http://www.synchro.net/source.html										*
  *																			*
- * You are encouraged to submit any modifications (preferably in Unix diff	*
- * format) via e-mail to mods@synchro.net									*
- *																			*
  * Note: If this box doesn't appear square, then you need to fix your tabs.	*
  ****************************************************************************/
 
@@ -240,9 +224,9 @@ DLLEXPORT uint16_t inet_addrport(union xp_sockaddr *addr);
 DLLEXPORT void inet_setaddrport(union xp_sockaddr *addr, uint16_t port);
 DLLEXPORT BOOL inet_addrmatch(union xp_sockaddr* addr1, union xp_sockaddr* addr2);
 DLLEXPORT char* socket_strerror(int, char*, size_t);
-
-#if defined(_WIN32) && !defined(_MSC_VER)
-DLLEXPORT int inet_pton(int af, const char *src, void *dst);
+DLLEXPORT int xp_inet_pton(int af, const char *src, void *dst);
+#if defined(_WIN32) // mingw and WinXP's WS2_32.DLL don't have inet_pton():
+	#define inet_pton	xp_inet_pton
 #endif
 
 #ifdef __cplusplus