Use EXTENSIONS instead of SKIPIF sections in *.phpt

This also fixes skipped tests due to different naming "zend-test"
instead of "zend_test" and "PDO" instead of "pdo":

- ext/do

Use EXTENSIONS instead of SKIPIF sections in *.phpt

This also fixes skipped tests due to different naming "zend-test"
instead of "zend_test" and "PDO" instead of "pdo":

- ext/dom/tests/libxml_global_state_entity_loader_bypass.phpt
- ext/simplexml/tests/libxml_global_state_entity_loader_bypass.phpt
- ext/xmlreader/tests/libxml_global_state_entity_loader_bypass.phpt
- ext/zend_test/tests/observer_sqlite_create_function.phpt

EXTENSIONS section is used for the Windows build to load the non-static
extensions.

Closes GH-13276

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Fix GH-8778: Integer arithmethic with large number variants fails

When casting a `variant` to `int`, we need to heed the proper `zval`
type, which is an signed 64bit integer on x64, whil

Fix GH-8778: Integer arithmethic with large number variants fails

When casting a `variant` to `int`, we need to heed the proper `zval`
type, which is an signed 64bit integer on x64, while `VT_INT` is only
a signed 32bit integer.

Closes GH-8779.

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