[PATCH] Use $CFLAGS to calculate multi_os_directory in configure.ac.

[Dominik Vogt]

While we're talking about installations paths:  "make istall"
should really install ffi.h to <prefix>/include/libffi... and not
to <prefix>/lib/libffi.../include.  It doen't respect --installdir=
either.

Ciao

Dominik ^_^  ^_^

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Dominik Vogt
IBM Germany