This extends the Python[3] shebang fixup to all packages.
Only Python scripts in `/usr/bin` will be handled at the moment. Later it
may make sense to also cover executables in `/bin`, though typically Python
executables shouldn't be placed there.
Previously the shebang handling was only done for python[3]-pip &
python[3]-setuptools.
Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>
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