Fix/38 musl ioctl redo

[JingMox]

Description

Fixes the bux-guest musl build. FIFREEZE/FITHAW were typed as libc::c_ulong, which only matches glibc's ioctl(int, unsigned long, ...) — musl follows POSIX with ioctl(int, int, ...), so both call sites failed with E0308 on the only targets bux-guest ships for.

This is a regression: the same fix landed in 03a2a0b (#39) but was dropped when that merge fell out of main's history.

Changes

• Type both constants as libc::Ioctl so the request width follows the target libc
• Use u32 literals — the width the kernel actually reads; zero-extends on glibc, wraps to c_int on musl, same low 32 bits either way

Verified on both musl targets plus gnu: release builds, clippy -- -D warnings, and fmt --check all pass.

Closes #38