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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Promote incorrect bzerr stream type to TypeError

This restores the signature we originally promised for PHP-8.0,
without the spurious false return type.

Fix stubs for bzerr* functions

These can return false if the stream is not a bz2 stream. Also
emit a warning in this case, this should not be failing silently.