Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (trailing-whitespace)
• debian/copyright: use spaces rather than tabs to start continuation lines. (tab-in-license-text)
• Use secure URI in Homepage field. (homepage-field-uses-insecure-uri)
• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)
• Use ?= for assignments to architecture variables.
• Update standards version to 4.1.5, 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 (out-of-date-standards-version)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/0f/2bef12aa625a09b4e693061e305cd24b09a44d.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/26/30167483c6bcd199a624cca63b190cbd7677d6.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/27/45e105efc634587fe066e2d871a664c154d1d2.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/6b/1c1ee2dbfe08b87d071fdb01f8c76a5b5f94d6.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/c5/e28528439f7321967925352cad1acf1e79fa92.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/09/e3533fe3a380ac9662a7a837c53e553deb3887.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/0d/668e6719300d2c3f505e1eaa26d1c7369b66d6.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/50/42824438c142654dbae240dd67ae50595737fc.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/d5/7342aa8c92d2c4f14998a8f6d6c4099e494ea4.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/fc/36cf66f6dca51fd82f696c23889fd288886798.debug

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

• Homepage: http​://mdocml.bsd.lv/ https​://mdocml.bsd.lv/

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

• Build-Ids: 09e3533fe3a380ac9662a7a837c53e553deb3887 0d668e6719300d2c3f505e1eaa26d1c7369b66d6 5042824438c142654dbae240dd67ae50595737fc d57342aa8c92d2c4f14998a8f6d6c4099e494ea4 fc36cf66f6dca51fd82f696c23889fd288886798 0f2bef12aa625a09b4e693061e305cd24b09a44d 2630167483c6bcd199a624cca63b190cbd7677d6 2745e105efc634587fe066e2d871a664c154d1d2 6b1c1ee2dbfe08b87d071fdb01f8c76a5b5f94d6 c5e28528439f7321967925352cad1acf1e79fa92

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This merge proposal was created by the Janitor bot, and it will automatically rebase or close this proposal as appropriate when the target branch changes. Any comments you leave here will be read by the Janitor's maintainers.

Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/mdocml/8dded251-020b-4ecb-b700-1dbe683ee04d.