Remove bug61371 test

These tests attempt to test that no memory is leaked for stream calls. However,
it is incorrect to assume the memory will not increase for other reasons, e.g.
when growing resource buffers, for the output buffer, etc. This was discovered
through 9cacc57 with USE_TRACKED_ALLOC=1, but
this can also fail with USE_ZEND_ALLOC=1 when increasing loop iterations.

Author: iluuu1994