Fix some issues reported by lintian

Fix some issues reported by lintian

• Update watch file format version to 4. (older-debian-watch-file-standard)

• Update standards version to 4.6.1, no changes needed. (out-of-date-standards-version)

This merge proposal was created automatically by the Janitor bot. For more information, including instructions on how to disable these merge proposals, see https://janitor.debian.net/lintian-fixes.

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/ocaml-dbus/7a95e15d-6e15-4677-b59f-41ba6891fbbb.

Debdiff

These changes affect the binary packages:

[The following lists of changes regard files as different if they have different names, permissions or owners.]

Files in second set of .debs but not in first

-rw-r--r--  root/root   /usr/lib/debug/.build-id/3e/c1d05a04ebf668c6bac429c801242f3d4d7ffa.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/d0/236c1cb0e7607fbdfd65ba08219c99f7722cba.debug

No differences were encountered between the control files of package **libdbus-ocaml**

Control files of package libdbus-ocaml-dbgsym: lines which differ (wdiff format)

• Build-Ids: d0236c1cb0e7607fbdfd65ba08219c99f7722cba 3ec1d05a04ebf668c6bac429c801242f3d4d7ffa

No differences were encountered between the control files of package **libdbus-ocaml-dev**

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