mv(1): Check for _ST_FLAGS_PRESENT_ availability.

While there, check for MNAMELEN availability that indicates presence of
f_mntonname field in struct statfs.

mv(1): Install signal handler only if SIGINFO is available.

kernel: Make chflags syscalls argument types consistent with userland.

There was an inconsistency between userland and syscalls argument types
that was inherited after initial fork. Adjust protot

kernel: Make chflags syscalls argument types consistent with userland.

There was an inconsistency between userland and syscalls argument types
that was inherited after initial fork. Adjust prototypes to use u_long
and add missing const char* too. Rerun sysent. Change tmpfs/dirfs to
use u_int for flags since mask for superuser changeable flags is
SF_SETTABLE 0xffff0000 (most fs use uint32_t), adjust mksubr script.
Remove no longer needed (u_long) casts I could find elsewhere.

While there, adjust unistd.h prototypes to use generic types too.

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