tools lib bpf: use __u32 from linux/types.h

Fixes the following issue when building without access to 'u32' type:

./tools/lib/bpf/bpf.h:27:23: error: unknown type name ‘u32’

Signed-off-by: Joe Stringer <joe@ovn.org>
Acked-by: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Link: http://lkml.kernel.org/r/20161209024620.31660-3-joe@ovn.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/lib/bpf/bpf.c

@@ -70,7 +70,7 @@ int bpf_create_map(enum bpf_map_type map_type, int key_size,
 
 int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns,
 		     size_t insns_cnt, char *license,
-		     u32 kern_version, char *log_buf, size_t log_buf_sz)
+		     __u32 kern_version, char *log_buf, size_t log_buf_sz)
 {
 	int fd;
 	union bpf_attr attr;
@@ -98,7 +98,7 @@ int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns,
 }
 
 int bpf_map_update_elem(int fd, void *key, void *value,
-			u64 flags)
+			__u64 flags)
 {
 	union bpf_attr attr;
 

tools/lib/bpf/bpf.h

@@ -30,11 +30,11 @@ int bpf_create_map(enum bpf_map_type map_type, int key_size, int value_size,
 #define BPF_LOG_BUF_SIZE 65536
 int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns,
 		     size_t insns_cnt, char *license,
-		     u32 kern_version, char *log_buf,
+		     __u32 kern_version, char *log_buf,
 		     size_t log_buf_sz);
 
 int bpf_map_update_elem(int fd, void *key, void *value,
-			u64 flags);
+			__u64 flags);
 
 int bpf_map_lookup_elem(int fd, void *key, void *value);
 int bpf_map_delete_elem(int fd, void *key);