Fix python include path for non-windows

[m-kuhn]

Fixes #36698

On macos/linux a wrong include path is reported by python since #34888

./tools/python3/python3.11 -c "import pprint;import sysconfig; pprint.pprint(sysconfig.get_paths())"                                                                     
{'data': '/home/mkuhn/dev/vcpkg/installed/x64-linux',
 'include': '/home/mkuhn/dev/vcpkg/include/python3.11',
 'platinclude': '/home/mkuhn/dev/vcpkg/include/python3.11',
 'platlib': '/home/mkuhn/dev/vcpkg/installed/x64-linux/lib/python3.11/site-packages',
 'platstdlib': '/home/mkuhn/dev/vcpkg/installed/x64-linux/lib/python3.11',
 'purelib': '/home/mkuhn/dev/vcpkg/installed/x64-linux/lib/python3.11/site-packages',
 'scripts': '/home/mkuhn/dev/vcpkg/installed/x64-linux/bin',
 'stdlib': '/home/mkuhn/dev/vcpkg/installed/x64-linux/lib/python3.11'}

[Neumann-A]

i wonder what exactly ${installed_base} is ?

'scripts': '/home/mkuhn/dev/vcpkg/installed/x64-linux/bin', is probably wrong and needs to be tools/python3

[m-kuhn]

I wonder what exactly scripts is.
On windows it points to 'scripts': '{base}/Scripts' is that where the python3 executable is located?

[Neumann-A]

On windows it points to 'scripts': '{base}/Scripts' is that where the python3 executable is located?

No its where all the additional binaries and scripts are located like pip or cython

[m-kuhn]

Changing this has an effect on many python packages

E.g. it will install wheel into tools and then building setuptools will complain

2024-02-12 23:02:37,198 gpep517 INFO Building wheel via backend setuptools.build_meta
usage: __main__.py [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
   or: __main__.py --help [cmd1 cmd2 ...]
   or: __main__.py --help-commands
   or: __main__.py cmd --help

error: invalid command 'bdist_wheel'

I think we can look into adjusting this path also, but I'd prefer to defer this for now and stick to this simple fix

[Neumann-A]

It has to be changed otherwise you need to manually move all the scripts. Also the tools/python3 needs to be on PATH so that everything in there can be found.

[m-kuhn]

@Neumann-A see open-vcpkg/python-registry#14 (logs can be found here https://github.com/open-vcpkg/python-registry/actions/runs/7882761603?pr=14)

[Neumann-A]

hmm I get

ERROR Missing dependencies:
	wheel

for some reason. ok let it be for now.