syscalls: Old setgroups(2)/getgroups(2): Remove superfluous STD type

[olce]

Summary

An examination of the scripts under 'sys/tools/syscalls' indicates that
keeping STD as a type in the presence of COMPATxx does not make any
difference, and regenerating system call files with STD removed does
indeed not show any difference. Moreover, this practice is inconsistent
with the rest of the file.

Thus, remove the superfluous STD type for the two above-mentioned system
calls. While here, re-order the remaining types for getgroups() to be
consistent with other such occurences (COMPATxx before CAPENABLED).

MFC after: 3 days
Sponsored by: The FreeBSD Foundation

[kevans]

Whoops, good shout.

[olce]

In D52499#1199013, @kevans wrote:

Whoops, good shout.

Glad you reviewed that, because I was wondering if this was deliberate or not (maybe you were cooking some other changes related to that).