fix build with PHP 8.6.0alpha2

[remicollet]

. The zval_dtor() alias of zval_ptr_dtor_nogc() has been removed.

. error_code => error_details.code

[remicollet]

Notice: this PR is only a build fix

It could make sense to also expose error_detail.line and error_details.column

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.97%. Comparing base (479c81b) to head (39b350a).

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
+ Coverage   82.60%   82.97%   +0.37%     
==========================================
  Files           1        1              
  Lines          46       47       +1     
  Branches        7        7              
==========================================
+ Hits           38       39       +1     
  Misses          5        5              
  Partials        3        3              

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