Fix some issues reported by lintian

Fix some issues reported by lintian

• Set upstream metadata fields: Name (from ./configure), Repository. (upstream-metadata-file-is-missing)
• Update standards version to 4.4.1, no changes needed. (out-of-date-standards-version)
• 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 (out-of-date-standards-version)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/xfce4-genmon-plugin/8dc60d91-f711-45ad-a0d2-6019d1c247fc.

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/bc/537320ebff1478fea86852947dab3e32e507c0.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/1c/d996311967b83ce48d7adf49ad0ddc096a5373.debug

No differences were encountered between the control files of package **xfce4-genmon-plugin**

Control files of package xfce4-genmon-plugin-dbgsym: lines which differ (wdiff format)

• Build-Ids: 1cd996311967b83ce48d7adf49ad0ddc096a5373 bc537320ebff1478fea86852947dab3e32e507c0

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