Whitespace: ocaml/gpg/gpg.ml

$ camlp4o -printer o -no_comments ocaml/gpg/gpg.ml | md5sum
83bf837cbe696c1c76f53893763c1617  -
$ git checkout HEAD^
$ camlp4o -printer o -no_comments ocaml/gpg/gpg.ml | md5sum
83bf837cbe696c1c76f53893763c1617  -

Signed-off-by: John Else <john.else@citrix.com>
Remove unexplained checksum from gpg.ml

This checksum was added many years ago, with no explanation and no
relation to the rest of the commit!

Signed-off-by: John Else <john.else@citrix.com>
Add comments

Signed-off-by: John Else <john.else@citrix.com>
CA-128701: Add new 64-bit gpg checksums

Signed-off-by: John Else <john.else@citrix.com>