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)
• Fix day-of-week for changelog entry 1.5.1+git20210215.e75adf8-r2. (debian-changelog-has-wrong-day-of-week)
• Update standards version to 4.6.1, no changes needed. (out-of-date-standards-version)
• Update standards version to 4.6.2, 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 (out-of-date-standards-version)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/15/4c67f7a80eaeb662a2c389d4d04a972997996e.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/3a/37c93d6784510c805df5beb7b8ef511d34f07c.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/a5/f0028fe86e1bbff74e3c3232e91d098b15446a.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/a9/740fc85edf758d23a0e2da14a2daaaa7556362.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/f1/08048d76b8338e857d4540b66c8b94c7fff1cd.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/0d/6dc331bc23b35721e3b7d830da67de4986256d.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/60/d6ba3dbfadb70ef2ea2a7977cb236a8c7c4ad8.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/99/f866297cd38cd3344575092531a5479c7f04da.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/d5/4d3c0695a1d0ec5394f0976dd83ff914e07fcf.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/ee/f10f1504b947ca74b71b2b185cc9bc1a7f3d1e.debug

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

No differences were encountered between the control files of package **librecast1**

Control files of package librecast1-dbgsym: lines which differ (wdiff format)

• Build-Ids: 0d6dc331bc23b35721e3b7d830da67de4986256d 60d6ba3dbfadb70ef2ea2a7977cb236a8c7c4ad8 99f866297cd38cd3344575092531a5479c7f04da d54d3c0695a1d0ec5394f0976dd83ff914e07fcf eef10f1504b947ca74b71b2b185cc9bc1a7f3d1e 154c67f7a80eaeb662a2c389d4d04a972997996e 3a37c93d6784510c805df5beb7b8ef511d34f07c a5f0028fe86e1bbff74e3c3232e91d098b15446a a9740fc85edf758d23a0e2da14a2daaaa7556362 f108048d76b8338e857d4540b66c8b94c7fff1cd

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Build and test logs for this branch can be found at https://janitor.debian.net/run/203dfe9a-804b-4c20-b698-603bbb2fa5c9.