Fix `std.Io` and `std.heap.page_allocator` on Wasm#25858

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castholm wants to merge 2 commits intoziglang:masterfrom

castholm:emscripten-fixes

Commits on Nov 16, 2025

Don't pull in a dependency on `pthread_kill` in single-threaded builds
castholm
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Use `mmap` `std.heap.page_allocator` impl when compiling for Wasm + libc
castholm
committed