gh-118039: Fix config.cache key on WASI

[nineteendo]

We need to include the current python version in the config.cache key.

-build_wasi_reusable-Linux--24168b7150a51bf2d84cf11b0c1766713f3008fec4733f0682c1e541e1764fc1
+build_wasi_reusable-Linux--24168b7150a51bf2d84cf11b0c1766713f3008fec4733f0682c1e541e1764fc1-/opt/hostedtoolcache/Python/3.12.3/x64

Otherwise the build can fail with an error like this:

configure: loading cache config.cache
configure: error: `PKG_CONFIG_PATH' has changed since the previous run:
configure:   former value:  `/opt/hostedtoolcache/Python/3.12.2/x64/lib/pkgconfig'
configure:   current value: `/opt/hostedtoolcache/Python/3.12.3/x64/lib/pkgconfig'
configure: error: in `/home/runner/work/cpython/cpython/cross-build/build':
configure: error: changes in the environment can compromise the build
configure: error: run `make distclean' and/or `rm config.cache'
	    and start over

• Issue: Problem with config cache of WASI #118039

[nineteendo]

Could someone add the skip news label? Thank you.

[hugovk]

Do we need it for all these five files? Some of them build their own Python and don't use actions/setup-python.

[nineteendo]

Ah, I see. I've added a comment to clarify why we need them for actions/setup-python.

[nineteendo]

I think that explains why it only failed on WASI.

[hugovk]

Thank you!

(cc @erlend-aasland in case you wanted to check)

[hugovk]

Backport: we don't have .github/workflows/reusable-wasi.yml in 3.12, and the only change would be to add the comment to .github/workflows/build.yml, so I think we can skip that.

Thank you @nineteendo! 🚀