Normalize COMPAT_43 syscall declarations.

[brooks]

Summary

Have ogetkerninfo, ogetpagesize, ogethostname, osethostname, and oaccept
declare o<foo>_args structs rather than non-compat ones. Due to a
failure to use NOARGS in most cases this adds only one new declaration.

No changes required in freebsd32 as only ogetpagesize() is implemented and it
has a 32-bit specific implementation.

[kib]

Remove SYSPROTO for them all, instead of patching ? It is not useful for current syscalls, and obviously even less so for compat.

Does freebsd32 need same treatment ?

[brooks]

In D15816#334486, @kib wrote:

Remove SYSPROTO for them all, instead of patching ? It is not useful for current syscalls, and obviously even less so for compat.

I like them as local documentation so will leave then undisturbed other than the rename where they match local style and members are used.

Does freebsd32 need same treatment ?

No, because it fails to implement all but getpagesize and that has an ofreebsd32_getpagesize() that returns IA32_PAGE_SIZE. The unimplemented cases are probably a bug, but it's not clear they matter even for aout binaries (4.4lite had already implemented all but accept() as userspace wrappers around sysctl()).

[brooks]

• Rebase
• GC duplicate, documentary definitions of _args structs.

[kib]

declErations, both it the title and in the text.