zstd features cannot be compiled in the musl environment.

[zzl221000]

rust: 1.95
musl env: apk add --no-cache  build-base openssl-dev curl-dev zlib-dev perl cmake clang clang-dev llvm

introduces the default features of zstd-sys, which causes bindgen's runtime features to be included by default. The default compilation error is as follows:
Unable to find libclang: "the libclang shared library at /usr/lib/llvm21/lib/libclang.so.21.1.2 could not be opened: Dynamic loading not supported"