Fix build with php85-beta2

References:
- https://wiki.php.net/rfc/remove_disable_classes
- php/php-src#12043

  CC     build/src/nxt_php_sapi-php85.o
cc -c -pipe -fPIC -fvisibility=hidden -fno-strict-overflow -funsigned-char -std=gnu11 -O -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -fno-strict-aliasing -Wstrict-overflow=5 -Wmissing-prototypes -Werror -g  -O2 -pipe  -fstack-protector-strong -fno-strict-aliasing    -I src -I build/include \
-I/usr/local/include/php -I/usr/local/include/php/main -I/usr/local/include/php/TSRM -I/usr/local/include/php/Zend -I/usr/local/include/php/ext -I/usr/local/include/php/ext/date/lib -DNXT_ZEND_SIGNAL_STARTUP=1 \
-MMD -MF build/src/nxt_php_sapi-php85.dep -MT build/src/nxt_php_sapi-php85.o \
-o build/src/nxt_php_sapi-php85.o src/nxt_php_sapi.c
src/nxt_php_sapi.c:714:37: error: no member named 'disable_classes' in 'struct _php_core_globals'
  714 |                                 &PG(disable_classes),
      |                                  ~~~^~~~~~~~~~~~~~~~
/usr/local/include/php/main/php_globals.h:31:30: note: expanded from macro 'PG'
   31 | # define PG(v) (core_globals.v)
      |                 ~~~~~~~~~~~~ ^
src/nxt_php_sapi.c:715:33: error: use of undeclared identifier 'zend_disable_class'
  715 |                                 zend_disable_class);
      |                                 ^
2 errors generated.
gmake[1]: *** [build/Makefile:2107: build/src/nxt_php_sapi-php85.o] Error 1

Author: osokin

src/nxt_php_sapi.c

@@ -93,8 +93,10 @@ static nxt_int_t nxt_php_alter_option(nxt_str_t *name, nxt_str_t *value,
 #ifdef NXT_PHP8
 static void nxt_php_disable_functions(nxt_str_t *str);
 #endif
+#if (PHP_VERSION_ID < 80500)
 static void nxt_php_disable(nxt_task_t *task, const char *type,
     nxt_str_t *value, char **ptr, nxt_php_disable_t disable);
+#endif
 
 static nxt_int_t nxt_php_dirname(const nxt_str_t *file, nxt_str_t *dir);
 static void nxt_php_str_trim_trail(nxt_str_t *str, u_char t);
@@ -710,9 +712,11 @@ nxt_php_set_options(nxt_task_t *task, nxt_conf_value_t *options, int type)
             }
 
             if (nxt_str_eq(&name, "disable_classes", 15)) {
+#if (PHP_VERSION_ID < 80500)
                 nxt_php_disable(task, "class", &value,
                                 &PG(disable_classes),
                                 zend_disable_class);
+#endif
                 continue;
             }
         }
@@ -817,6 +821,8 @@ nxt_php_disable_functions(nxt_str_t *str)
 #endif
 
 
+#if (PHP_VERSION_ID < 80500)
+
 static void
 nxt_php_disable(nxt_task_t *task, const char *type, nxt_str_t *value,
     char **ptr, nxt_php_disable_t disable)
@@ -868,6 +874,8 @@ nxt_php_disable(nxt_task_t *task, const char *type, nxt_str_t *value,
     } while (c != '\0');
 }
 
+#endif
+
 
 static nxt_int_t
 nxt_php_dirname(const nxt_str_t *file, nxt_str_t *dir)