Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (trailing-whitespace)
• Use secure copyright file specification URI. (insecure-copyright-format-uri)
• Bump debhelper from deprecated 9 to 13. (package-uses-deprecated-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)
• Set upstream metadata fields: Bug-Database, Bug-Submit. (upstream-metadata-missing-bug-tracking)

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/6f/17fc4d15f51ea4c1f1428e30f40e326608c748.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/71/61a5b54ee6aaec392110472f1e2f90a57f02ed.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/b1/81d723108532f98c84107a7ce15633c6c11a26.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/3a/96a74719488ab415f9463199af2d7ca825298a.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/9e/3f789da79296d23cb7ae8df10f18c5a2b44faf.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/e4/8c7c79101d23bec0aaa12b34ba8ffe16acb642.debug

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

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

• Build-Ids: 3a96a74719488ab415f9463199af2d7ca825298a 9e3f789da79296d23cb7ae8df10f18c5a2b44faf e48c7c79101d23bec0aaa12b34ba8ffe16acb642 6f17fc4d15f51ea4c1f1428e30f40e326608c748 7161a5b54ee6aaec392110472f1e2f90a57f02ed b181d723108532f98c84107a7ce15633c6c11a26

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Build and test logs for this branch can be found at https://janitor.debian.net/run/17ad58fd-8cd6-4dd9-a83c-64cb0f018833.