[Toybox] big endian problems

[Andy Lutomirski]

One more minor note:

> The kernel, C library, and compiler must all agree which ABI is in use or the binaries won't run.

This isn't quite true.  You can build a kernel that supports OABI and
EABI.  The result is worse performance (the syscall entry code needs
to read the syscall instruction, wasting a dcache line) and missing
features (at least seccomp filters and audit are unavailable because
no cares enough to fix an ABI glitch).

--Andy

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