net/libmaxminddb: Remove incorrect _POSIX_C_SOURCE

- Bump PORTREVISION for package change

PR:		272349
Reported by:	Mina Galic <freebsd@igalic.co>
Reference:	maxmind/libmaxminddb#318

net/libmaxminddb/Makefile

@@ -1,5 +1,6 @@
 PORTNAME=	libmaxminddb
 PORTVERSION=	1.7.1
+PORTREVISION=	1
 CATEGORIES=	net
 MASTER_SITES=	https://github.com/maxmind/libmaxminddb/releases/download/${PORTVERSION}/
 

net/libmaxminddb/files/patch-include_maxminddb.h

@@ -0,0 +1,21 @@
+--- include/maxminddb.h.orig	2022-09-30 21:50:22 UTC
++++ include/maxminddb.h
+@@ -5,18 +5,6 @@ extern "C" {
+ #ifndef MAXMINDDB_H
+ #define MAXMINDDB_H
+
+-/* Request POSIX.1-2008. However, we want to remain compatible with
+- * POSIX.1-2001 (since we have been historically and see no reason to drop
+- * compatibility). By requesting POSIX.1-2008, we can conditionally use
+- * features provided by that standard if the implementation provides it. We can
+- * check for what the implementation provides by checking the _POSIX_VERSION
+- * macro after including unistd.h. If a feature is in POSIX.1-2008 but not
+- * POSIX.1-2001, check that macro before using the feature (or check for the
+- * feature directly if possible). */
+-#ifndef _POSIX_C_SOURCE
+-#define _POSIX_C_SOURCE 200809L
+-#endif
+-
+ #include "maxminddb_config.h"
+ #include <stdarg.h>
+ #include <stdbool.h>