[autoconf-conversion] libffi

[Tom Tromey]

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

Paolo> What do you mean?

See AM_ENABLE_MULTILIB and the Multilibs node in the automake manual.
I think if you call this you won't need the AC_CONFIG_AUX_DIR hacks
at all -- they'll be handled for you.  Likewise this will let you
remove code from Makefile.am, which is a good thing since the
existing code relies on undocumented names.

In particular you can get rid of all the *-multi targets, the
*-recursive targets (in Makefile.am, they are just used to add a
dependency) and the "Multilib support variables" paragraph.

Tom