Defines starting with `l' in netiso

• lc_flags netiso/iso_snpac.h:101
• lc_ht netiso/iso_snpac.h:100
• LISTENING netiso/cons_pcb.h:128
• LITTLE_ENDIAN netiso/clnp.h:70
• LLC_SIZE netiso/iso_snpac.c:166
• LOCAL_CREDIT_EXPAND netiso/tp_subr2.c:79
• LOW_NIBBLE netiso/if_cons.c:182