Fix BSD build, adding missing linker flag.

config.lib

@@ -991,6 +991,9 @@ make_cflags_and_ldflags() {
 	if [ "$os" = "BEOS" ] || [ "$os" = "HAIKU" ] || [ "$os" = "OSX" ] || [ "$os" = "MORPHOS" ] || [ "$os" = "FREEBSD" ] || [ "$os" = "OPENBSD" ] || [ "$os" = "NETBSD" ] || [ "$os" = "HPUX" ] || [ "$os" = "SUNOS" ] || [ "$os" = "OS2" ]; then
 		CFLAGS="$CFLAGS -DUNIX"
 	fi
+	if [ "$os" = "FREEBSD" ] || [ "$os" = "OPENBSD" ] || [ "$os" = "NETBSD" ]; then
+		LIBS="$LIBS -lintl"
+	fi
 	# And others like Windows
 	if [ "$os" = "MINGW" ] || [ "$os" = "CYGWIN" ] || [ "$os" = "WINCE" ]; then
 		CFLAGS="$CFLAGS -DWIN"

src/os/strings.h

@@ -84,7 +84,7 @@
 
 	#if !defined(__MINGW32__) && defined(__GNUC__) && !defined(snprintf)
 		/* (v)snprintf is in fact C99, but we like to use it over (v)sprintf for the obvious reasons */
-		#if !defined(__APPLE__) && !defined(TOS) && !defined(__FreeBSD__) && !defined(__DJGPP__)
+		#if !defined(__APPLE__) && !defined(TOS) && !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__DJGPP__)
 			extern int snprintf (char *__restrict __s, size_t __maxlen, __const char *__restrict __format, ...) __THROW __attribute__ ((__format__ (__printf__, 3, 4)));
 			extern int vsnprintf (char *__restrict __s, size_t __maxlen, __const char *__restrict __format, va_list __arg) __THROW __attribute__ ((__format__ (__printf__, 3, 0)));
 		#endif /* __APPLE__ */