Harden Arch PKGBUILD checks by falling back to mkntfs when mkfs.ntfs is absent

[Copilot]

The Build Arch package GitHub Actions job failed during makepkg test execution because NTFS test setup assumed mkfs.ntfs exists on PATH. In some Arch environments, ntfs-3g provides mkntfs instead, causing the NTFS E2E resize test to fail before package build completion.

• Root-cause alignment

  • Removed the hard dependency on a single NTFS formatter binary name in dualboot test utilities.

• NTFS formatter invocation

  • Introduced a small helper in src/arch/dualboot/test_utils.rs that:
    • tries mkfs.ntfs first
    • falls back to mkntfs on NotFound
    • preserves existing failure behavior for all other execution errors

• Diagnostics

  • Improved missing-binary error text to explicitly report both attempted commands.

• Targeted test coverage

  • Added a focused test that validates NTFS formatter invocation through the shared helper path.

for formatter in ["mkfs.ntfs", "mkntfs"] {
    match Command::new(formatter).arg("-F").arg("-Q").arg(path).status() {
        Ok(status) => return Ok(status),
        Err(err) if err.kind() == ErrorKind::NotFound => continue,
        Err(err) => return Err(err),
    }
}