Fix some issues reported by lintian

Fix some issues reported by lintian

• Use secure URI in Homepage field. (homepage-field-uses-insecure-uri)

• Bump debhelper from old 12 to 13. (package-uses-old-debhelper-compat-version)

• Update standards version to 4.6.1, no changes needed. (out-of-date-standards-version)

• Avoid explicitly specifying -Wl,--as-needed linker flag. (debian-rules-uses-as-needed-linker-flag)

This merge proposal was created automatically by the Janitor bot. For more information, including instructions on how to disable these merge proposals, see https://janitor.debian.net/lintian-fixes.

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/fdclone/4fb73a8d-2892-4785-9167-5c5bad289f97.

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/ef/228544d6fc01afef4983ac4f8c7880571d4a1f.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/b0/014b82044935a600df78f6171aa8798f64e732.debug

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

• Homepage: [-http​://hp.vector.co.jp/authors/VA012337/soft/fd/-] {+https​://hp.vector.co.jp/authors/VA012337/soft/fd/+}

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

• Build-Ids: b0014b82044935a600df78f6171aa8798f64e732 ef228544d6fc01afef4983ac4f8c7880571d4a1f

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