Fix some issues reported by lintian

Fix some issues reported by lintian

• Use versioned copyright format URI. (unversioned-copyright-format-uri)
• Use secure URI in Homepage field. (homepage-field-uses-insecure-uri)
• Update standards version to 4.6.1, no changes needed. (out-of-date-standards-version)

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/modplugtools/c30cd18b-8865-49f7-ab71-475963ecf509.

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/69/d0cfb4ee0ff15b2910e27c9aaf006e22945345.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/ac/c63a568cd3f485b7e01164a333c1e441b65d3e.debug

Control files of package modplug-tools: lines which differ (wdiff format)

• Homepage: [-http​://modplug-xmms.sourceforge.net/-] {+https​://modplug-xmms.sourceforge.net/+}

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

• Build-Ids: acc63a568cd3f485b7e01164a333c1e441b65d3e 69d0cfb4ee0ff15b2910e27c9aaf006e22945345

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