MAC: syscalls: mac_label_copyin(): 32-bit compatibility

Needed by the upcoming setcred() system call. More generally, is a step
on the way to support 32-bit compatibility for MAC-related system cal

MAC: syscalls: mac_label_copyin(): 32-bit compatibility

Needed by the upcoming setcred() system call. More generally, is a step
on the way to support 32-bit compatibility for MAC-related system calls.

Reviewed by: brooks
Approved by: markj (mentor)
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D47878

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MAC: syscalls: Split mac_set_proc() into reusable pieces

This is in preparation for enabling the new setcred() system call to set
a process' MAC label.

No functional change (intended).

MFC after:

MAC: syscalls: Split mac_set_proc() into reusable pieces

This is in preparation for enabling the new setcred() system call to set
a process' MAC label.

No functional change (intended).

MFC after: 2 weeks
Approved by: markj (mentor)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D46905

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