minetest: Fix build on NetBSD 9.

games/minetest/distinfo

@@ -1,4 +1,4 @@
-$NetBSD: distinfo,v 1.9 2023/08/13 19:07:10 pin Exp $
+$NetBSD: distinfo,v 1.10 2023/08/28 07:01:28 nia Exp $
 
 BLAKE2s (minetest-5.7.0/irrlicht.tar.gz) = e68f98b5b1e24e21919eab7fed281cac3a5b935c6b4c93db7cdcd428ddc7f15a
 SHA512 (minetest-5.7.0/irrlicht.tar.gz) = 216221b5073d2b234b2d19658b30517c3abb2677c16e3a9b7fd31c15431bd2ffc047a68851c5bebf94aeb178d6b761a80c2f5744a7498cdac1d7b65fed139cc0
@@ -11,3 +11,4 @@ SHA512 (minetest-5.7.0/minetest.tar.gz) = 6a934db5fd2c7c14fcfa87fb306662fa1ccf20
 Size (minetest-5.7.0/minetest.tar.gz) = 10115973 bytes
 SHA1 (patch-lib_irrlichtmt_source_Irrlicht_CIrrDeviceLinux.cpp) = 22099c0803dcdb74055d69bb810e54b9832f2d3e
 SHA1 (patch-lib_irrlichtmt_source_Irrlicht_os.cpp) = c7f2c8529874f76029641f0281d7cda0f3797971
+SHA1 (patch-src_util_string.cpp) = f240efd440fa540c1f767735892b9177089a8f30

games/minetest/patches/patch-src_util_string.cpp

@@ -0,0 +1,34 @@
+$NetBSD: patch-src_util_string.cpp,v 1.6 2023/08/28 07:01:29 nia Exp $
+
+Support non-POSIX iconv on NetBSD before 10 and SunOS.
+
+--- src/util/string.cpp.orig	2023-04-08 16:04:52.000000000 +0000
++++ src/util/string.cpp
+@@ -39,6 +39,15 @@ with this program; if not, write to the 
+ 	#include <windows.h>
+ #endif
+ 
++#if defined(__NetBSD__)
++#include <sys/param.h>
++#if __NetBSD_Prereq__(9,99,17)
++#define NETBSD_POSIX_ICONV 1
++#else
++#define NETBSD_POSIX_ICONV 0
++#endif
++#endif
++
+ #ifndef _WIN32
+ 
+ static bool convert(const char *to, const char *from, char *outbuf,
+@@ -54,7 +63,11 @@ static bool convert(const char *to, cons
+ 	const size_t old_outbuf_size = *outbuf_size;
+ 	size_t old_size = inbuf_size;
+ 	while (inbuf_size > 0) {
++#if (defined(__NetBSD__) && !NETBSD_POSIX_ICONV) || defined(__sun)
++		iconv(cd, (const char **)&inbuf_ptr, inbuf_left_ptr, &outbuf_ptr, outbuf_size);
++#else
+ 		iconv(cd, &inbuf_ptr, inbuf_left_ptr, &outbuf_ptr, outbuf_size);
++#endif
+ 		if (inbuf_size == old_size) {
+ 			iconv_close(cd);
+ 			return false;