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linux-user/syscall.c: remove wrong forward decl of setgroups()
this declaration is wrong:
the correct prototype on linux is:
int setgroups(size_t size, const gid_t *list);
since by default musl libc exposes this symbol in unistd.h
additionally to grp.h, the wrong declaration causes a build error.
the proper fix is to simply include the correct header.
Signed-off-by: John Spencer <maillist-qemu@barfooze.de>
Reviewed-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>