Fixing windows build issues

Author: jrepp

ipv6_config.h.in

@@ -4,3 +4,9 @@
 #cmakedefine HAVE_STDIO_H 1
 #cmakedefine HAVE_STDARG_H 1
 #cmakedefine HAVE__SNPRINTF_S 1
+
+#if WIN32
+#pragma warning(disable: 4820) // Disable alignment errors in windows headers
+#pragma warning(disable: 4255) // Disable prototype () -> (void) conversion warning
+#pragma warning(disable: 5045) // Disable /Qspectre mitigation info warnings
+#endif

ipv6_test_config.h.in

@@ -1,5 +1,6 @@
 // For test code only
 #cmakedefine HAVE_WINSOCK_2_H 1
+#cmakedefine HAVE_WS_2_TCPIP_H 1
 #cmakedefine HAVE_SYS_SOCKET_H 1
 #cmakedefine HAVE_NETINET_IN_H 1
 #cmakedefine HAVE_ARPA_INET_H 1