Fix threaded build under WASI

[brettcannon]

Bug report

Bug description:

https://bytecodealliance.zulipchat.com/#narrow/stream/217126-wasmtime/topic/.60missing.20required.20memory.20export.60.20for.20threaded.20CPython/near/397361259

I think you'll want -Wl,--export-memory (the --export-memory to wasm-ld) to get past that check; threaded modules for WASI need to both import and export their memory right now.

CPython versions tested on:

3.12

Operating systems tested on:

Other

Linked PRs

• gh-111046: for wasi-threads, export memory as well #111099
• [3.12] gh-111046: for wasi-threads, export memory as well via the linker (GH-111099) #111141

[brettcannon]

Probably need to change the following line to include --export-memory:

cpython/configure.ac

Line 2168 in c9aef19

AS_VAR_APPEND([LDFLAGS_NODIST], [" -Wl,--import-memory"])