fix for PHP 8.0.0beta2

[remicollet]

From UPGRADING.INTERNALS

  s. The zend_fcall_info no_separation flag has been removed, and separation is
      never allowed. If you wish to pass (or allow passing) arguments by
      reference, explicitly create those arguments as references using
      ZEND_MAKE_REF. This removal also affects call_user_function_ex(), which
      should be replaced by call_user_function().

[remicollet]

PHP_VERSION : 8.0.0beta2

=====================================================================
TEST RESULT SUMMARY
---------------------------------------------------------------------
Exts skipped    :    0
Exts tested     :   16
---------------------------------------------------------------------

Number of tests :   65                49
Tests skipped   :   16 ( 24.6%) --------
Tests warned    :    0 (  0.0%) (  0.0%)
Tests failed    :    0 (  0.0%) (  0.0%)
Tests passed    :   49 ( 75.4%) (100.0%)
---------------------------------------------------------------------
Time taken      :    7 seconds
=====================================================================