Fix some issues reported by lintian

Fix some issues reported by lintian

• Use secure URI in Homepage field. (homepage-field-uses-insecure-uri)
• Update standards version to 4.6.2, no changes needed. (out-of-date-standards-version)

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/cc/4e28983557d46139ec7813d7b2eedd62eebedd.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/cc/5e4db474dfecec6bd87783109063132b890378.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/13/c3d2d860ca2746d28770d902c23c39611853e6.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/67/4c3f65ff11cc2e398f70a519f6ea535cd02061.debug

Control files of package xsynth-dssi: lines which differ (wdiff format)

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

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

• Build-Ids: 13c3d2d860ca2746d28770d902c23c39611853e6 674c3f65ff11cc2e398f70a519f6ea535cd02061 cc4e28983557d46139ec7813d7b2eedd62eebedd cc5e4db474dfecec6bd87783109063132b890378

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/xsynth-dssi/f5cbe151-a3a0-4ba1-bb80-4c2fd28dc233.