Use __DIR__-relative path in tests

Otherwise we can't run them from another directory, they'll fail
instead.

Fix bug #75306: Memleak in SoapClient

Setting the stream context via php_stream_context_to_zval() will
increase the reference count. So if the new context is created, then it
will en

Fix bug #75306: Memleak in SoapClient

Setting the stream context via php_stream_context_to_zval() will
increase the reference count. So if the new context is created, then it
will end up with a reference count of 2 while it should be 1.

Credits to cmb for the analysis. I arrived at the same patch as he did.

Closes GH-12523.

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