[wasm] Fix emsdk check

[radekdoulik]

We use system python on osx too

[radekdoulik]

@mkhamoyan please check that it fixes the issue with the sample build for you

[mkhamoyan]

@mkhamoyan please check that it fixes the issue with the sample build for you

@radekdoulik yes this fixed the issue, thanks!

[akoeplinger]

We use system python on osx too

That's not what we intended, we should use our own python on osx and windows. Only Linux uses the system python.

[radekdoulik]

We use system python on osx too

That's not what we intended, we should use our own python on osx and windows. Only Linux uses the system python.

do you remember what is the reason?

I think it might have changed in #100266

[akoeplinger]

MacOS doesn't ship with Python anymore, you probably just have it installed from homebrew like I do.
We need to fix whatever got broken to use the Python packages that we build.

[radekdoulik]

Let's merge it for now. I have opened new issue to not forget about it. #103120