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Rmdir() and stat() don't work when using bionic on some architectures.
Rmdir() uses __NR_unlinkat with AT_REMOVEDIR and stat uses
__NR_fstatat64 and __NR_newstatat with AT_SYMLINK_NOFOLLOW.
We should allow these syscalls when COMMAND_RMDIR and
COMMAND_STAT are allowed, respectively.

Change-Id: I54953e10f899e07ebadf2ee784179e897fcc1dd2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391618
Commit-Queue: Matthew Denton <mpdenton@google.com>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805515}