Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (trailing-whitespace)

• Use secure copyright file specification URI. (insecure-copyright-format-uri)

• Bump debhelper dependency to >= 9, since that's what is used in debian/compat. (no-versioned-debhelper-prerequisite)

• Bump debhelper from deprecated 9 to 13. (package-uses-deprecated-debhelper-compat-version)

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

• 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/rox/d273d350-61c7-45bb-90ae-5f70db67dd36.

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/03/ae8a7be9d0f50d69560d83767e6c4d4dc2b174.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/be/ac90612ff2f9d88f77822e780abd1bbd906844.debug

Control files of package rox-filer: lines which differ (wdiff format)

• Depends: libc6 (>= 2.33), 2.34), libgdk-pixbuf-2.0-0 (>= 2.22.0), libglib2.0-0 (>= 2.35.9), libgtk2.0-0 (>= 2.24.0), libice6 (>= 1:1.0.0), libpango-1.0-0 (>= 1.14.0), libsm6, libx11-6, libxml2 (>= 2.7.4), shared-mime-info, sensible-utils

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

• Build-Ids: beac90612ff2f9d88f77822e780abd1bbd906844 03ae8a7be9d0f50d69560d83767e6c4d4dc2b174

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