libct: fix mips compilation

[kolyshkin]

On MIPS arches, Rdev is uint32 so we have to convert it.

Can't test this for mips in CI (adding mips compile which is not easy as distros drop mips support).

Tested locally with:

GOARCH=mips64le go build -tags "seccomp urfave_cli_no_docs" -o runc .

(which still errors out but it's not related).

Fixes: #4962.

Fixes: 8476df8 ("libct: add/use isDevNull, verifyDevNull")
Fixes: de87203 ("console: verify /dev/pts/ptmx before use")
Fixes: 398955b ("console: add fallback for pre-TIOCGPTPEER kernels")
Reported-by: @tianon

[Copilot]

Pull Request Overview

This PR addresses type conversion issues for stat.Rdev across different architectures, specifically MIPS where Rdev is uint32 instead of uint64. The changes add explicit conversions to uint64 before comparing with or passing to functions that expect uint64, preventing compiler warnings or errors on platforms where Rdev is not uint64.

Key Changes:

• Add uint64() type conversions for stat.Rdev comparisons and function calls
• Include //nolint:unconvert comments to suppress linter warnings on architectures where the conversion is unnecessary

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
libcontainer/rootfs_linux.go	Converts stat.Rdev to uint64 in device comparison and Major/Minor function calls
libcontainer/console_linux.go	Converts stat.Rdev to uint64 in ptmx and pty peer device verification code

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