Fix some issues reported by lintian

Fix some issues reported by lintian

• Set upstream metadata fields: Bug-Database, Bug-Submit, Contact, Repository-Browse. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking)

• 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 (out-of-date-standards-version)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/gnome-font-viewer/18610f18-3967-4fd7-8f9d-7ffe77dae174.

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/13/c3337cb95752f186d5faeef3e4524027fe312e.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/3c/94f5967cfaeffeb049e2d241925e437541f9a5.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/2e/0aafa55c5b82514471f1337e01df1d718dec72.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/40/b5d2f478182f5bd6cc14fe2a3a974c3b82e79f.debug

No differences were encountered between the control files of package **gnome-font-viewer**

Control files of package gnome-font-viewer-dbgsym: lines which differ (wdiff format)

• Build-Ids: 2e0aafa55c5b82514471f1337e01df1d718dec72 40b5d2f478182f5bd6cc14fe2a3a974c3b82e79f 13c3337cb95752f186d5faeef3e4524027fe312e 3c94f5967cfaeffeb049e2d241925e437541f9a5

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