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 (out-of-date-standards-version)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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The bot will automatically update the merge proposal to resolve merge conflicts or close the merge proposal when all changes are applied through other means (e.g. cherry-picks). Updates may take several hours to propagate.

Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/omake/dc2535fe-4127-466e-931f-f50ad4888905.

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/71/dd0d4ca127db0380fca691ce90f9dd133b6cb9.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/f3/e21b627064cc1c67fef3f78f5d14c51947c863.debug

No differences were encountered between the control files of package **omake**

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

• Build-Ids: f3e21b627064cc1c67fef3f78f5d14c51947c863 71dd0d4ca127db0380fca691ce90f9dd133b6cb9

No differences were encountered between the control files of package **omake-doc**

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