Fix some issues reported by lintian

Fix some issues reported by lintian

• Update standards version to 4.6.1, no changes needed. (out-of-date-standards-version)
• Avoid explicitly specifying -Wl,--as-needed linker flag. (debian-rules-uses-as-needed-linker-flag)
• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository-Browse. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking)

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/libvolatilestream/f0aba50c-befe-419d-8ea4-5a221080b9bc.

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/87/0aaa1722f5c6293fe3dec6f9830e1fedbab4ac.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/51/d72fc95f03a3c596a21e730a145fcd568cc51a.debug

No differences were encountered between the control files of package **libvolatilestream-dev**

No differences were encountered between the control files of package **libvolatilestream0**

Control files of package libvolatilestream0-dbgsym: lines which differ (wdiff format)

• Build-Ids: 51d72fc95f03a3c596a21e730a145fcd568cc51a 870aaa1722f5c6293fe3dec6f9830e1fedbab4ac

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