Unskip "$changeStream must be the first stage in a change stream pipeline sent to the server"

> ./cmake-build/src/mongocxx/test/test_change_stream_specs --section change-streams.json

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

test_change_stream_specs is a Catch v2.10.2 host application.

Run with -? for options

-------------------------------------------------------------------------------

Change stream spec tests

  change-streams.json

  $changeStream must be the first stage in a change stream pipeline sent to the

  server

-------------------------------------------------------------------------------

../src/mongocxx/test/spec/change_stream.cpp:83

...............................................................................

../src/mongocxx/test/spec/change_stream.cpp:83: FAILED:

  {Unknown expression after the reported line}

due to a fatal error condition:

  checking for path from environment variable: CHANGE_STREAM_TESTS_PATH

  Test path: /Users/kevinalbertson/code/mongo-cxx-driver/data/change_stream/

  change-streams.json

  SIGSEGV - Segmentation violation signal

===============================================================================

test cases: 1 | 1 failed

assertions: 6 | 5 passed | 1 failed

Segmentation fault: 11