[autoconf-conversion] libffi take 2

[Tom Tromey]

>>>>> "Paolo" == Paolo Bonzini <bonzini at gnu.org> writes:

Paolo> Here is take 2 at updating libffi.

I have more suggestions.  Hope you don't mind.

Paolo> I'm hitting exponential behavior in Automake somewhere

Report this -- I know Alexandre has been fixing these pretty
regularly.

Paolo>  MULTISRCTOP =
Paolo>  MULTIBUILDTOP =
Paolo>  MULTIDIRS =
Paolo>  MULTISUBDIR =

You should be able to remove all of these.

Paolo> +# It still complains about o32.s and o32.S, so let's do this.
Paolo> +%_cpp.s: %.s
Paolo> +	cp $< $@

"%" rules aren't portable.  Let's not use them.  I'm not sure what the
problem is exactly, but I'm sure we can fix it some other way.

Tom