Avoid #define collisions with <linux/filter.h> or stuff it includes.

Some programs, e.g. pktgen-dpdk, include both <linux/filter.h> and
<pcap/bpf.h> in the same source file; both of them have BPF-instruction

Just as we protect against <net/bpf.h> and <pcap/bpf.h> colliding, we
protect against <linux/filter.h> and <pcap/bpf.h> colliding, although we
need to protect fewer things as <linux/filter.h> doesn't define
everything we need.

This should address GitHub pull request #933.

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