[libc] Add setgroups and initgroups entrypoints (#227272) Add the setgroups and initgroups entrypoints from <grp.h> (GNU extensions). A Linux syscall wrapper is added for setgroups, supporting both SYS_setgroups and SYS_setgroups32. The initgroups entrypoint initialises the supplementary group access list for a specified user by reading the group database using a scoped database stream and setting the resulting groups via setgroups. Assisted-by: Automated tooling, human reviewed.
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