[PATCH net-next] bpfilter: fix a build err

[YueHaibing]

gcc-7.3.0 report following err:

  HOSTCC  net/bpfilter/main.o
In file included from net/bpfilter/main.c:9:0:
./include/uapi/linux/bpf.h:12:10: fatal error: linux/bpf_common.h: No such file or directory
 #include <linux/bpf_common.h>

remove it by adding a include path.
Fixes: d2ba09c17a06 ("net: add skeleton of bpfilter kernel module")

Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 net/bpfilter/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bpfilter/Makefile b/net/bpfilter/Makefile
index 2af752c..3f3cb87 100644
--- a/net/bpfilter/Makefile
+++ b/net/bpfilter/Makefile
@@ -5,7 +5,7 @@
 
 hostprogs-y := bpfilter_umh
 bpfilter_umh-objs := main.o
-HOSTCFLAGS += -I. -Itools/include/
+HOSTCFLAGS += -I. -Itools/include/ -Itools/include/uapi
 ifeq ($(CONFIG_BPFILTER_UMH), y)
 # builtin bpfilter_umh should be compiled with -static
 # since rootfs isn't mounted at the time of __init
-- 
2.7.0