Fix some issues reported by lintian

Fix some issues reported by lintian

• Bump debhelper from old 11 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)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/mdp-src/ee3d2835-b105-4688-a4e7-80115219948f.

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/06/35b3959f44d0e8b9a8c4e0ac1803c8c0e0d8d4.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/1b/e1c89ba0ac83416ef3d981d13e25807beff57d.debug

Control files of package mdp: lines which differ (wdiff format)

• Depends: libc6 (>= 2.4), 2.34), libncursesw6 (>= 6), libtinfo6 (>= 6)

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

• Build-Ids: 1be1c89ba0ac83416ef3d981d13e25807beff57d 0635b3959f44d0e8b9a8c4e0ac1803c8c0e0d8d4

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