Fix some issues reported by lintian

Fix some issues reported by lintian

• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository-Browse. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking)

• Update standards version to 4.6.1, 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 (out-of-date-standards-version)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/camlidl/de894bab-8a8e-4c40-8944-0955d22febdc.

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/27/7ff6f609c0f01ddf4eed131717db541611fdb4.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/15/b174abcd3729371520b38d5fc4a7889b00ce60.debug

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

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

• Build-Ids: 15b174abcd3729371520b38d5fc4a7889b00ce60 277ff6f609c0f01ddf4eed131717db541611fdb4

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