Fix some issues reported by lintian

Fix some issues reported by lintian

• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository-Browse.

• 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 (out-of-date-standards-version)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)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/arachne-pnr/e5a999ed-fe6f-45f7-8d92-306dbc23021b.

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/b8/0f65743e19946fe945e244a4dbcd420b9901a9.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/b3/178bc9c3095139e0a777ff6cb6707f382a1710.debug

No differences were encountered between the control files of package **arachne-pnr**

No differences were encountered between the control files of package **arachne-pnr-chipdb**

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

• Build-Ids: b3178bc9c3095139e0a777ff6cb6707f382a1710 b80f65743e19946fe945e244a4dbcd420b9901a9

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