Allow compiling newly added if_index.c (at least on 2.4), missing __u32/__u16/__s32
Allow compiling newly added if_index.c (at least on 2.4), missing __u32/__u16/__s32

joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc