python3-setuptools: restore build_scripts.executable support

python3-setuptools: restore build_scripts.executable support

We encountered an issue when running python scripts provided by
python3-fail2ban. The shebang '#!/usr/bin/env python3' was replaced by
'#!python', which caused these scripts to fail to run.

For example:
$ head -n 1 /usr/bin/fail2ban-testcases
 #!python
$ /usr/bin/fail2ban-testcases
-sh: /usr/bin/fail2ban-testcases: cannot execute: required file not found

This issue was introduced by commit[1] in python3-setuptools 75.3.2. See
the upstream issue report[2] for more information.

Backport patches from [3] to fix this issue.

[1] https://github.com/pypa/setuptools/commit/c71266345c64fd662b5f95bbbc6e4536172f496d
[2] https://github.com/pypa/setuptools/issues/4934
[3] https://github.com/pypa/distutils/pull/358

Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>