should include

[Guy Harris]

<net/bpf.h> defines ioctl codes, so it should include <sys/ioccom.h>,  
so it doesn't require code that includes <net/bpf.h> to also include  
<sys/ioccom.h> or a header that includes it.  When I originally  
created <sys/ioccom.h> in SunOS 4.0, I intended it to be included by  
header files that defined ioctls, rather than by .c files.