Revert "dist/debian: support relocatable python3 on Debian variants"
This reverts commit 4d119cbd6d. It breaks build_deb.sh:
18:39:56 + seastar/scripts/perftune.py seastar/scripts/seastar-addr2line seastar/scripts/perftune.py
18:39:56 Traceback (most recent call last):
18:39:56 File "./relocate_python_scripts.py", line 116, in <module>
18:39:56 fixup_scripts(archive, args.scripts)
18:39:56 File "./relocate_python_scripts.py", line 104, in fixup_scripts
18:39:56 fixup_script(output, script)
18:39:56 File "./relocate_python_scripts.py", line 79, in fixup_script
18:39:56 orig_stat = os.stat(script)
18:39:56 FileNotFoundError: [Errno 2] No such file or directory: '/data/jenkins/workspace/scylla-master/unified-deb/scylla/build/debian/scylla-package/+'
18:39:56 make[1]: *** [debian/rules:19: override_dh_auto_install] Error 1
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