Fix some issues reported by lintian

Fix some issues reported by lintian

• Set upstream metadata fields: Security-Contact.

• Drop unused build-dependency on cdbs. (unused-build-dependency-on-cdbs)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/pugixml/6bd58838-a77b-4eab-b43a-f8d9f430e6e4.

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/09/8f8c388d8134c32ced8ef1349d820a7b010ab1.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/0a/b6d8debdc5152eabf16db0e4f5f84507b93bb4.debug

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

No differences were encountered between the control files of package **libpugixml1v5**

Control files of package libpugixml1v5-dbgsym: lines which differ (wdiff format)

• Build-Ids: 0ab6d8debdc5152eabf16db0e4f5f84507b93bb4 098f8c388d8134c32ced8ef1349d820a7b010ab1

No differences were encountered between the control files of package **pugixml-doc**

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