python module: fix broken non-embed dependency

The `py.dependency(embed: false)` method is supposed to consistently
provide a distutils-like `python.pc` / `python-embed.pc` interface
regardless of Python version. It handles both pkg-config and sysconfig
scraping. For the latter, we respect the value of self.link_libpython
as determined by distutils, and construct a fully custom dependency. For
the former, we blindly assume pkg-config is correct.

It isn't correct, not until Python 3.8 when embed was added. Before
then, we need to process the pkg-config dependency based on
link_libpython. We did this, but only inside the extension_module
method, which is obviously wrong.

Delete the special casing from extension_module, and handle it inside
the dependency.

Fixes #11097

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