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 (out-of-date-standards-version)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/xzoom/e4ada4de-7d06-49e0-939c-90f50171d46c.

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/a1/09c18f44ddeea7c5fa500dcf1983593a812133.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/fb/8879df818aacf198c94f7e593442a5b5382609.debug

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

• Depends: libc6 (>= 2.14), 2.34), libx11-6, libxext6

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

• Build-Ids: fb8879df818aacf198c94f7e593442a5b5382609 a109c18f44ddeea7c5fa500dcf1983593a812133

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