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 4.6.1, no changes needed. (out-of-date-standards-version)
• 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 (out-of-date-standards-version)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/0c/c698d42ba9de5dcae24127f3752be4c2bc9e63.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/64/0f420f2a423c04f5ef789a25c40364e722b794.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/b5/53162e9d07d2b038b1086f7993fbfc57228385.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/4d/3664f1146c0a23e479b5c000cf3b521d772e42.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/8e/e8b7c887624099ca67870122a548e7cec9cabf.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/b1/f612b8c34b4fe587084a4dd35de4a4413c1286.debug

Control files of package libnspr4: lines which differ (wdiff format)

• Homepage: [-http​://www.mozilla.org/projects/nspr/-] {+https​://www.mozilla.org/projects/nspr/+}

Control files of package libnspr4-dbgsym: lines which differ (wdiff format)

• Build-Ids: 4d3664f1146c0a23e479b5c000cf3b521d772e42 8ee8b7c887624099ca67870122a548e7cec9cabf b1f612b8c34b4fe587084a4dd35de4a4413c1286 0cc698d42ba9de5dcae24127f3752be4c2bc9e63 640f420f2a423c04f5ef789a25c40364e722b794 b553162e9d07d2b038b1086f7993fbfc57228385

Control files of package libnspr4-dev: lines which differ (wdiff format)

• Homepage: [-http​://www.mozilla.org/projects/nspr/-] {+https​://www.mozilla.org/projects/nspr/+}

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Build and test logs for this branch can be found at https://janitor.debian.net/run/c96b2c79-d10b-4133-a3d2-6335914697bc.