Fix some issues reported by lintian

Fix some issues reported by lintian

• Bump debhelper from old 11 to 12. (package-uses-old-debhelper-compat-version)
• Set upstream metadata fields: Bug-Database, Repository, Repository-Browse. (upstream-metadata-file-is-missing)

This merge proposal was created automatically by the Janitor bot.

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/fdk-aac/383eeb5a-b381-4e12-ab37-e20414b098b1.

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 .changes but not in first

-rw-r--r--  root/root   /usr/lib/debug/.build-id/d4/7bbf81739f679aca76cc31f49d9a49d4a753d7.debug

Files in first .changes but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/04/2799d8029fa42963d55508fe3d66e41bb1eb7c.debug

No differences were encountered between the control files of package **aac-enc**

No differences were encountered between the control files of package **aac-enc-dbgsym**

No differences were encountered between the control files of package **libfdk-aac-dev**

No differences were encountered between the control files of package **libfdk-aac1**

Control files of package libfdk-aac1-dbgsym: lines which differ (wdiff format)

• Build-Ids: 042799d8029fa42963d55508fe3d66e41bb1eb7c d47bbf81739f679aca76cc31f49d9a49d4a753d7

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