WasmVM: WASI sysroot missing libc functions (ffsll, inet_ntop)

[NathanFlurry]

Summary

Some POSIX libc functions compile but do not work correctly at runtime in the WASI sysroot:

• ffsll() (find first set bit in long long) — may be missing or stubbed in musl-wasi
• inet_ntop() (network address to presentation string) — compiled but fails at runtime, likely due to incomplete network address handling in WASI libc

Affected os-test cases

• basic/strings/ffsll
• basic/arpa_inet/inet_ntop

Expected behavior

Both functions should produce correct POSIX-compliant results.

Context

Discovered via os-test POSIX conformance suite. Tracked in posix-exclusions.json as fail / patched-sysroot.

[NathanFlurry]

Fixed in 780dabad — ffsll fixed with corrected long long type, inet_ntop reimplemented with RFC 5952 compliant IPv6 formatting.