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 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/sslsplit/921ff077-66ac-4a52-9b08-fc50722e68f1.

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/9b/ddf76ee27b228d3ca40707da1f1c3d4cef5e93.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/5a/79d1bfad38d7b75f6d85dacd0764542e3a56ff.debug

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

• Homepage: http​://www.roe.ch/SSLsplit https​://www.roe.ch/SSLsplit

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

• Build-Ids: 5a79d1bfad38d7b75f6d85dacd0764542e3a56ff 9bddf76ee27b228d3ca40707da1f1c3d4cef5e93

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