tests: remove unused bpf.h

This header is unused, and not present on kernels w/o CONFIG_BPF_SYSCALL,
so let's not require it.
Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/seccomp_filter.c

@@ -7,7 +7,6 @@
 #include <linux/seccomp.h>
 #include <linux/filter.h>
 #include <linux/limits.h>
-#include <linux/bpf.h>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <sys/socket.h>

test/zdtm/live/static/seccomp_filter_inheritance.c

@@ -7,7 +7,6 @@
 #include <linux/seccomp.h>
 #include <linux/filter.h>
 #include <linux/limits.h>
-#include <linux/bpf.h>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <sys/socket.h>

test/zdtm/live/static/seccomp_filter_tsync.c

@@ -7,7 +7,6 @@
 #include <linux/seccomp.h>
 #include <linux/filter.h>
 #include <linux/limits.h>
-#include <linux/bpf.h>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <sys/socket.h>