Fix some issues reported by lintian

Fix some issues reported by lintian

• 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 (out-of-date-standards-version)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/stacer/54fafa1d-8f67-4b93-a4f0-ae7f3878c599.

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/65/ed6bc25010ac75ffa782dbaf345631e5b140e5.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/c3/3c145ecf6d513798b6a996eafce7246a62ff95.debug

Control files of package stacer: lines which differ (wdiff format)

• Depends: libc6 (>= 2.14), 2.34), libgcc-s1 (>= 3.0), libqt5charts5 (>= 5.7.1), libqt5core5a (>= 5.15.1), libqt5gui5 (>= 5.14.1) | libqt5gui5-gles (>= 5.14.1), libqt5network5 (>= 5.0.2), libqt5widgets5 (>= 5.3.0), libstdc++6 (>= 4.1.1), fonts-league-spartan

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

• Build-Ids: c33c145ecf6d513798b6a996eafce7246a62ff95 65ed6bc25010ac75ffa782dbaf345631e5b140e5

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