Set error_log to an empty value if the test relies on that feature

Some tests fail if the error_log is overriden by the loaded ini
configuration. Explicitly set it to an empty value to p

Set error_log to an empty value if the test relies on that feature

Some tests fail if the error_log is overriden by the loaded ini
configuration. Explicitly set it to an empty value to prevent the
failures.
See https://github.com/php/php-src/issues/10737#issuecomment-1452899299

Closes GH-10772.

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Migrate SKIPIF -> EXTENSIONS (#7138)

This is an automated migration of most SKIPIF extension_loaded checks.

Fix #79919: Stack use-after-scope in define()

Instead of the temporary `rv`, we use the `val_free` which is there for
this purpose.