hdf5

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

* commit '7796cbd4174e85aa211dbffa562ada7413f1dbf7':
  Fix build errors VOL changes, when using --disable-deprecated-symbols.
  Removed RELEASE.txt entry concerning --enable-debug/production configure flags as those changes were pushed to HDF5 1.10.
  Remove reference to h5_vol_external_log_native.