Macros starting with `h' in BSD4-4

• HASH kern/kern_synch.c:243
• HIADDR i386/isa/if_apx.c:317
• HOLDRELE sys/vnode.h:189
• howmany sys/param.h:170
• HTOC netiso/clnp.h:92
• htonl i386/include/endian.h:76
• htons i386/include/endian.h:77