$OpenBSD: patch-lib_libpcp_src_net_sock_ntop_c,v 1.1 2020/09/17 12:34:22 thfr Exp $

add missing define, as found in code/windows_stub/config.h and
lib/libpcp/src/windows/pcp_win_defines.h (identical)

Index: lib/libpcp/src/net/sock_ntop.c
--- lib/libpcp/src/net/sock_ntop.c.orig
+++ lib/libpcp/src/net/sock_ntop.c
@@ -23,6 +23,9 @@
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+/* Doesn't get picked up from Windows header files, therefore added here: */
+#define AI_V4MAPPED                 0x00000800
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #else
