Fix some issues reported by lintian

Fix some issues reported by lintian

• Use correct machine-readable copyright file URI. (out-of-date-copyright-format-uri)
• Update standards version to 4.6.2, no changes needed. (out-of-date-standards-version)
• Avoid explicitly specifying -Wl,--as-needed linker flag. (debian-rules-uses-as-needed-linker-flag)

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/29/5abbf6bf3b988f119e82fa701f00c6c1b607ec.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/74/0e6a8d166e2951cdef56d14fbd7eaf1cf33666.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/73/88a48701cafd68f194f76dfcb6cfbc8b42a3f8.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/74/e67c4f11cb99a102259c7a3e3ec4bd984e0eec.debug

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

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

• Build-Ids: 7388a48701cafd68f194f76dfcb6cfbc8b42a3f8 74e67c4f11cb99a102259c7a3e3ec4bd984e0eec 295abbf6bf3b988f119e82fa701f00c6c1b607ec 740e6a8d166e2951cdef56d14fbd7eaf1cf33666

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This merge proposal was created by the Janitor bot, and it will automatically rebase or close this proposal as appropriate when the target branch changes. Any comments you leave here will be read by the Janitor's maintainers.

Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/dact/d56a6c19-495c-4517-8e46-9fd32e2d636e.