Fix some issues reported by lintian

Fix some issues reported by lintian

• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)
• Update standards version to 4.5.0, 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 (out-of-date-standards-version)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/phonon-backend-vlc/e75b5121-399d-4abd-8132-90fa2d378244.

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/a3/9b962164fe00d7ede17d184db6e1eb1aa4505d.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/cf/ecb31a9c800625d8f6c4a76288411cde115ab6.debug

No differences were encountered between the control files of package **phonon4qt5-backend-vlc**

Control files of package phonon4qt5-backend-vlc-dbgsym: lines which differ (wdiff format)

• Build-Ids: cfecb31a9c800625d8f6c4a76288411cde115ab6 a39b962164fe00d7ede17d184db6e1eb1aa4505d

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