[Midnightbsd-cvs] src: Makefile: add missing header

[laffer1 at midnightbsd.org]

Log Message:
-----------
add missing header

Modified Files:
--------------
    src/lib/libffi:
        Makefile (r1.2 -> r1.3)
        (http://cvsweb.midnightbsd.org/src/lib/libffi/Makefile?r1=1.2&r2=1.3)