ffi: pad retval to ffi_arg size on all platforms.

* ffi.c (pad_retval): Define same way regardless of
big or little endian. For instance, we don't want to
call alloca(1) for a char return value. It could be
the case on little endian targets that libffi prepares
an entire ffi_arg return value. Even though we just read
the low order byte, we still have to prepare enough space
for the whole thing.

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