[PATCH 2/5] libbpf: add missing typedef

[Matteo Croce <mcroce@redhat.com>]

Sync tools/include/linux/types.h with the UAPI one to fix this build error:

make -C samples/bpf/../../tools/lib/bpf/ RM='rm -rf' LDFLAGS= srctree=samples/bpf/../../ O=
  HOSTCC  samples/bpf/sock_example
In file included from samples/bpf/sock_example.c:27:
/usr/include/linux/ip.h:102:2: error: unknown type name ‘__sum16’
  102 |  __sum16 check;
      |  ^~~~~~~
make[2]: *** [scripts/Makefile.host:92: samples/bpf/sock_example] Error 1
make[1]: *** [Makefile:1763: samples/bpf/] Error 2

Signed-off-by: Matteo Croce <mcroce@redhat.com>
---
 tools/include/linux/types.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/include/linux/types.h b/tools/include/linux/types.h
index 154eb4e3ca7c..5266dbfee945 100644
--- a/tools/include/linux/types.h
+++ b/tools/include/linux/types.h
@@ -58,6 +58,9 @@ typedef __u32 __bitwise __be32;
 typedef __u64 __bitwise __le64;
 typedef __u64 __bitwise __be64;
 
+typedef __u16 __bitwise __sum16;
+typedef __u32 __bitwise __wsum;
+
 typedef struct {
 	int counter;
 } atomic_t;
-- 
2.21.0