[PATCH -next] tools headers: Make linux/btf_ids.h self-contained

[Gaosheng Cui]

Add the missing #include <linux/types.h>.

Fix the following compile error:
  In file included from main.c:73:
  tools/include/linux/btf_ids.h:7:9: error: unknown type name ‘u32’
    7 |         u32 cnt;
      |         ^~~
  tools/include/linux/btf_ids.h:8:9: error: unknown type name ‘u32’
    8 |         u32 ids[];
      |         ^~~

Signed-off-by: Gaosheng Cui <cuigaosheng1@xxxxxxxxxx>
---
 tools/include/linux/btf_ids.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/include/linux/btf_ids.h b/tools/include/linux/btf_ids.h
index 72535f00572f..7969607efe0d 100644
--- a/tools/include/linux/btf_ids.h
+++ b/tools/include/linux/btf_ids.h
@@ -3,6 +3,8 @@
 #ifndef _LINUX_BTF_IDS_H
 #define _LINUX_BTF_IDS_H
 
+#include <linux/types.h>
+
 struct btf_id_set {
 	u32 cnt;
 	u32 ids[];
-- 
2.25.1