`make install` should only ever copy files

[daywalker90]

Several times now i encountered an issue with make install doing other things than just copying files. For example: sometimes it would try to compile rust binaries even if you just ran uv run make or now it would try this in the nightly plugins repo CI:

mkdir -p /usr/local/share/man/man7
mkdir -p /usr/local/share/man/man8
mkdir -p /usr/local/share/doc/c-lightning
wiregen wire/peer_wiregen.h
Traceback (most recent call last):
  File "/home/runner/work/plugins/plugins/lightning/tools/generate-wire.py", line 27, in <module>
    from mako.template import Template
ModuleNotFoundError: No module named 'mako'
make: *** [Makefile:359: wire/peer_wiregen.h] Error 1
rm wire/peer_wiregen.h

This all comes from the fact that both rust and uv are often installed per user and make install is often called with sudo which will have a different environment. So if possible make install should not run any python scripts that require dependencies or compile anything ever.