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)

• 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/qpwgraph/9868df91-ea6d-4545-9322-c40d01049271.

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/7a/1023ae77849cffb32cd40071b889568a2f651e.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/30/58ccc506b81f9abe05d9347f51135f108e7af3.debug

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

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

• Build-Ids: 3058ccc506b81f9abe05d9347f51135f108e7af3 7a1023ae77849cffb32cd40071b889568a2f651e

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