Fix some issues reported by lintian

Fix some issues reported by lintian

• Update lintian override info format in d/source/lintian-overrides on line 2. (mismatched-override)
• 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 (out-of-date-standards-version)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/64/e8ee412fdf854c7b166c73c939d651abc50065.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/d4/fca22a55beaff36e8b04f3af56207eaf6fdcaa.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/7c/09eceb6d176fed55c8658ab7c34c5dc121aa62.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/dc/d11f1db6fbb7eeeb14c375063d13270d98fed1.debug

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

• Homepage: [-http​://www.quut.com/gsm/-] {+https​://www.quut.com/gsm/+}

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

• Build-Ids: dcd11f1db6fbb7eeeb14c375063d13270d98fed1 64e8ee412fdf854c7b166c73c939d651abc50065

Control files of package libgsm1: lines which differ (wdiff format)

• Homepage: [-http​://www.quut.com/gsm/-] {+https​://www.quut.com/gsm/+}

Control files of package libgsm1-dbgsym: lines which differ (wdiff format)

• Build-Ids: 7c09eceb6d176fed55c8658ab7c34c5dc121aa62 d4fca22a55beaff36e8b04f3af56207eaf6fdcaa

Control files of package libgsm1-dev: lines which differ (wdiff format)

• Homepage: [-http​://www.quut.com/gsm/-] {+https​://www.quut.com/gsm/+}

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Build and test logs for this branch can be found at https://janitor.debian.net/run/97f053d9-92d1-4bd9-a7d4-0da413deb9a2.