Add support for zOS (#1581)

Signed-off-by: v1gnesh <[email protected]>

Author: v1gnesh

httplib.h

@@ -172,9 +172,15 @@ using socket_t = SOCKET;
 #else // not _WIN32
 
 #include <arpa/inet.h>
-#ifndef _AIX
+#if !defined(_AIX) && !defined(__MVS__)
 #include <ifaddrs.h>
 #endif
+#ifdef __MVS__
+#include <strings.h>
+#ifndef NI_MAXHOST
+#define NI_MAXHOST 1025
+#endif
+#endif
 #include <net/if.h>
 #include <netdb.h>
 #include <netinet/in.h>
@@ -2805,7 +2811,7 @@ inline bool bind_ip_address(socket_t sock, const std::string &host) {
   return ret;
 }
 
-#if !defined _WIN32 && !defined ANDROID && !defined _AIX
+#if !defined _WIN32 && !defined ANDROID && !defined _AIX && !defined __MVS__
 #define USE_IF2IP
 #endif