hdf5_ep

Merging in latest from upstream (HDFFV/hdf5:refs/heads/develop)

* commit 'b3a89155b986bca9c436d4ff6c229a68ac23f1ef':
  Update buffer count
  Revert PR 405 (https://bitbucket.hdfgroup.org/projects/HDFFV/repos/hdf5/pull-requests/405/overview) and reimplement with correct and simpler code.
  Revert "    Checkin of fix for CGNS bug"
  Revert "Removed commeted out code from H5C_dump_coll_write_list()"
  Adds RELEASE.txt note about HDFS VFD stubs being removed
  MinGW uses "MinGW Makefiles"
  The version string has a second use for packaging
  Bug fix to allow pass-through VOL connectors to set DXPL properties (like requesting collective operations) on dataset I/O
  Add back function for VERIFY_EXTERNAL_CONSOLIDATION
  Removes inappropriate file locking call
  Trivial whitespace change to H5Pencdec.c
  Minor refactoring based on 1.10 normalization work
  Trivialities noticed while normalizing 1.10