Fix GH-13177: PHP 8.3.2: final private constructor not allowed when used in trait

zend_compile has an exception to this rule for constructors using
`zend_is_constructor`, which compares

Fix GH-13177: PHP 8.3.2: final private constructor not allowed when used in trait

zend_compile has an exception to this rule for constructors using
`zend_is_constructor`, which compares the function name to
`__construct`. Sadly, `zend_is_constructor` is not a public API, but we
can just do the string compare ourselves.

Closes GH-13179.

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