cpython3: enable building of more modules

[AdamKorcz]

I am preparing a set of fuzzers for cpython's modules. Currently, the build.sh file does not build and link many of the cpython modules. This PR adds more modules to the cpython OSS-Fuzz build in preparation of fuzzing them.

@ammaraskar @alex @gpshead for info

[ammaraskar]

Does oss-fuzz require the entire project to be built as one static binary? I'm a little hesitant to complicate the build process away too much from standard python-config provided flags since it risks breaking with upstream build system changes.

Could I see a draft PR of the follow-up fuzzers you have? Maybe they might be better suited to live in https://github.com/python/library-fuzzers instead of the ones in the core interpreter which are mostly meant to exercise the C-api.

[AdamKorcz]

I have created a PR with my current Module fuzzers here: python/library-fuzzers#8.

This PR with the changes to cpython3's build is not fully up to date so I am converting to draft.