[autoconf-conversion] libffi

[Bonzini]

> You don't need this.  Instead, add "subdir-objects" to
> AUTOMAKE_OPTIONS.  This will preserve the existing behavior of
> putting .o files in subdirectories.

Ah, ok.

> The AC_CONFIG_AUX_DIRS thing is ugly.

Plain wrong actually.  The problem is with autoconf; I still have to understand how
srcdir is passed and why I have to add those ..'s

> I wonder if automake's built-in multilib support helps here.

What do you mean?

Paolo