Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (trailing-whitespace)

• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)

• Update standards version to 4.2.1, no changes needed. (out-of-date-standards-version)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/gbgoffice/a1682432-f4ae-4ab9-9b64-c698ac142914.

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/42/81320d3cc88a04cdd9e51930987a5bf88a5fd2.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/31/b083859e86fe5ef716f0462401ec76e47d2d14.debug

No differences were encountered between the control files of package **gbgoffice**

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

• Build-Ids: 31b083859e86fe5ef716f0462401ec76e47d2d14 4281320d3cc88a04cdd9e51930987a5bf88a5fd2

You can also view the diffoscope diff (unfiltered).