Incomplete source file list for _zstd in Modules/Setup

[maxyz]

Bug report

The _zstd entry in Modules/Setup only lists _zstd/_zstdmodule.c, omitting _zstd/zstddict.c, _zstd/compressor.c, and _zstd/decompressor.c.

When attempting to build _zstd as a static/built-in module via Modules/Setup (or Modules/Setup.local), the build fails at link time with undefined references:

undefined reference to `zstd_dict_type_spec'
undefined reference to `zstd_compressor_type_spec'
undefined reference to `zstd_decompressor_type_spec'

CPython versions tested on:

3.15

Operating systems tested on:

Linux

Linked PRs

• gh-158683: Fix missing source files for _zstd in Modules/Setup #158672