Fix some issues reported by lintian

Fix some issues reported by lintian

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

• Drop transition for old debug package migration. (debug-symbol-migration-possibly-complete)

• 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/phasex/9fe6c20c-7373-472e-b1e0-6aa1c3569c11.

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/7c/f3b3aa37978daf6463059d73a149e6a17ee3d9.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/18/da3fa6384b8de2fd63c2fb86e74fa0cf6acd0b.debug

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

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

• Breaks: phasex-dbg (<< 0.14.97-3~)
• Build-Ids: 18da3fa6384b8de2fd63c2fb86e74fa0cf6acd0b 7cf3b3aa37978daf6463059d73a149e6a17ee3d9
• Replaces: phasex-dbg (<< 0.14.97-3~)

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