Fix some issues reported by lintian

Fix some issues reported by lintian

• Update lintian override info format in d/source/lintian-overrides on line 2-5. (mismatched-override)
• Trim trailing whitespace. (trailing-whitespace)
• Set upstream metadata fields: Repository-Browse. (upstream-metadata-file-is-missing)
• Fix day-of-week for changelog entry 2.0.4-1. (debian-changelog-has-wrong-day-of-week)
• Update standards version to 4.6.1, no changes needed. (out-of-date-standards-version)

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/81/de0f2e34e593285c98644f9245cdd5fe2371df.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/d6/15a7ef370e4b98b0b8c73247319d37888a32e1.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/53/7cd04ac537a7a2de7c20536aacb7c4095ead80.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/ee/74ef473b3b559139499c2b529cac87ae0e9e45.debug

Control files of package libosip2-15: lines which differ (wdiff format)

• Depends: libc6 (>= 2.17) 2.34)

Control files of package libosip2-15-dbgsym: lines which differ (wdiff format)

• Build-Ids: 537cd04ac537a7a2de7c20536aacb7c4095ead80 ee74ef473b3b559139499c2b529cac87ae0e9e45 81de0f2e34e593285c98644f9245cdd5fe2371df d615a7ef370e4b98b0b8c73247319d37888a32e1

No differences were encountered between the control files of package **libosip2-dev**

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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/libosip2/75e4a217-c55b-43b1-ab29-511439ab1167.