Fix some issues reported by lintian

Fix some issues reported by lintian

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

• Bump debhelper from old 12 to 13. (package-uses-old-debhelper-compat-version)

• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)

• Set upstream metadata fields: Repository-Browse. (upstream-metadata-file-is-missing)

• 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 (out-of-date-standards-version)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/lablgl/0a4d091f-0eeb-44d6-a583-81a75e4faa5b.

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/4c/13f06a67a30d0988238c89323f282e8c3a58ca.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/b5/fbf00a2df9b3577cae6518347a16be2028e885.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/b6/83bf11f77fee6c3941986f04b9046f8c4cd805.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/37/61d8e67598db8034be773cb96320f1be0554ba.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/5c/bdc12b3a897aa7760fba7be92a7c3f42900e58.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/9c/04d8013e90f1c05fac42ef0cf5b6cd21408594.debug

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

• Depends: liblabltk-ocaml-go925, ocaml-base-4.13.1, freeglut3 (>= 2.8.1), libc6 (>= 2.14), libgl1, libglu1-mesa | libglu1, libglut3.12 (>= 3.4.0), libtcl8.6 (>= 8.6.0), libtk8.6 (>= 8.6.0), libx11-6, libxmu6 (>= 2:1.1.3)

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

• Build-Ids: 3761d8e67598db8034be773cb96320f1be0554ba 5cbdc12b3a897aa7760fba7be92a7c3f42900e58 9c04d8013e90f1c05fac42ef0cf5b6cd21408594 4c13f06a67a30d0988238c89323f282e8c3a58ca b5fbf00a2df9b3577cae6518347a16be2028e885 b683bf11f77fee6c3941986f04b9046f8c4cd805

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

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