Fix #79191: Error in SoapClient ctor disables DOMDocument::save()

The culprit is the too restrictive fix for bug #71536, which prevents
`php_libxml_streams_IO_write()` from properly exec

Fix #79191: Error in SoapClient ctor disables DOMDocument::save()

The culprit is the too restrictive fix for bug #71536, which prevents
`php_libxml_streams_IO_write()` from properly executing when unclean
shutdown is flagged. A *more* suitable solution is to move the
`xmlwriter_free_resource_ptr()` call from the `free_obj` handler to an
added `dtor_obj` handler, to avoid to write to a closed stream in case
of late object freeing. This makes the `EG(active)` guard superfluous.

We also fix bug79029.phpt which has to use different variables for the
three parts to actually check the original shutdown issue.

Thanks to bwoebi and daverandom for helping to investigate this issue.

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Fixed bug #79029 (Use After Free's in XMLReader / XMLWriter).

We backport the fix PHP 7.3, since this branch is affected as well.

(cherry picked from commit b5e004379647bd1ebb75eb2e

Fixed bug #79029 (Use After Free's in XMLReader / XMLWriter).

We backport the fix PHP 7.3, since this branch is affected as well.

(cherry picked from commit b5e004379647bd1ebb75eb2eac8826fb6abdd3d8)
(cherry picked from commit e36daa6927c05d2e687bb77495ef206cde118b33)
(cherry picked from commit 2704ee6844c03348de9d15e74646d09007ef0f7c)

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Fix test case

As of PHP 7.3.0, unlinking files with open handles is possible on
Windows, but these file entries are still blocked until all open
handles are closed. Since this test

Fix test case

As of PHP 7.3.0, unlinking files with open handles is possible on
Windows, but these file entries are still blocked until all open
handles are closed. Since this test doesn't require to write to the
same file, we use three separate files.

We also add the missing skip check for XMLReader.

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Fixed bug #79029 (Use After Free's in XMLReader / XMLWriter).

Revert "Fixed bug #79029 (Use After Free's in XMLReader / XMLWriter)"

This reverts commit d8ad2f4695ebd6dc2d4e668d9baeac1c071791a6.

Fixed bug #79029 (Use After Free's in XMLReader / XMLWriter)