Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (trailing-whitespace)

• Bump debhelper from old 10 to 13. (package-uses-old-debhelper-compat-version)

• Avoid explicitly specifying -Wl,--as-needed linker flag. (debian-rules-uses-as-needed-linker-flag)

This merge proposal was created automatically by the Janitor bot. For more information, including instructions on how to disable these merge proposals, see https://janitor.debian.net/lintian-fixes.

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/caps/0a7545fe-0e76-481f-9c3b-27268e9961a3.

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/c2/b3fcbebdeefa21cdc66fd608c2d4070373e7b5.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/cc/c6789b875f3748e515cb7d6772c8de79d2b6ae.debug

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

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

• Build-Ids: ccc6789b875f3748e515cb7d6772c8de79d2b6ae c2b3fcbebdeefa21cdc66fd608c2d4070373e7b5

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