Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (trailing-whitespace)

• Bump debhelper from old 11 to 13. (package-uses-old-debhelper-compat-version)

• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)

• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository-Browse. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/fcgiwrap/9f5e9924-3f22-41b0-b75d-e34cd5a667fa.

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/75b4dbfee4ed43d345cffc1f89745a105528f2.debug
-rwxr-xr-x  root/root   DEBIAN/preinst

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/f9/7b761713503588c619c88a569069be751a92c2.debug

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

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

• Build-Ids: f97b761713503588c619c88a569069be751a92c2 7a75b4dbfee4ed43d345cffc1f89745a105528f2

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