[PATCH libXi] Fix bus error on MIPS N32 for bug #38331.

[Michał Masłowski]

> This is issue is by no means MIPS N32-specific.  Most 32-bit
> architectures will suffer from the same issue.  A very similar issue
> popped up in the xserver/test/xinput.c, where we eventually settled
> for assuming double-alignment on all platforms except __i386__ and
> __sh__.

I don't have any experience with other architectures requiring 64-bit
alignment of doubles (the ones I know about have 64-bit longs or
pointers so they wouldn't have this problem) and I wanted to avoid
adding the padding when it's not needed.

> It probably is best to use "sizeof(double)" instead of "8" since that
> is a bit more xpressive.

I'll change the patch to fix both of these problems and align also in
case of XIScrollClassInfo.
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