ffsb: configure.in: Update and add foreign

Update deprecated syntax

Add foreign (fixes autoreconf)

Reported-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
configure.ac: Add AC_CONFIG_MACRO_DIR

Otherwise macros in m4 directory are not found on autoreconf

Signed-off-by: Cyril Hrubis <chrubis@suse.cz>