Update vendor/illumos/dist to illumos-gate 13991:53e4f9da98a1
Update vendor/illumos/dist to illumos-gate 13991:53e4f9da98a1

Illumos ZFS issues:
  3641 want a histogram of compressed block sizes

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase