databases/php-tarantool: Fix build with PHP 8.5 Beta 2+

PHP 8.5 Beta 2 changed the #define HASH_KEY_NON_EXISTENT to an enum in [1]. It
breaks the #ifndef check in php-tarantool. Since HASH_KEY_NON_EXISTENT exists in
all supported PHP versions, it is safe to simply remove the check.

Reference:	https://github.com/php/php-src/commit/bf64dfcd99f2f14753d8301dd3d4a85cdd53afc7 [1]
		https://pkg-status.freebsd.org/beefy18/data/main-amd64-default/p118fb2971704_s4ab64e34911/logs/php85-tarantool-0.4.0.log
		https://pkg-status.freebsd.org/beefy17/data/15stable-amd64-default/56c5cbbc8d99/logs/php85-tarantool-0.4.0.log

databases/php-tarantool/files/patch-php85

@@ -0,0 +1,13 @@
+--- src/tarantool_msgpack.c.orig	2024-07-04 16:18:34 UTC
++++ src/tarantool_msgpack.c
+@@ -5,10 +5,6 @@
+ 
+ #include "third_party/msgpuck.h"
+ 
+-#ifndef    HASH_KEY_NON_EXISTENT
+-#define    HASH_KEY_NON_EXISTENT HASH_KEY_NON_EXISTANT
+-#endif  /* HASH_KEY_NON_EXISTENT */
+-
+ /* UTILITES */
+ 
+ int smart_string_ensure(smart_string *str, size_t len) {