Switch kernel header parsing to python libclang

Replace the tokenizer in cpp.py with libclang.

Bug: 18937958
Change-Id: I27630904c6d2849418cd5ca3d3c612ec3078686d
diff --git a/libc/kernel/uapi/linux/if_alg.h b/libc/kernel/uapi/linux/if_alg.h
index 35f161c..eabd884 100644
--- a/libc/kernel/uapi/linux/if_alg.h
+++ b/libc/kernel/uapi/linux/if_alg.h
@@ -21,17 +21,17 @@
 #include <linux/types.h>
 struct sockaddr_alg {
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __u16 salg_family;
- __u8 salg_type[14];
- __u32 salg_feat;
- __u32 salg_mask;
+  __u16 salg_family;
+  __u8 salg_type[14];
+  __u32 salg_feat;
+  __u32 salg_mask;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __u8 salg_name[64];
+  __u8 salg_name[64];
 };
 struct af_alg_iv {
- __u32 ivlen;
+  __u32 ivlen;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __u8 iv[0];
+  __u8 iv[0];
 };
 #define ALG_SET_KEY 1
 #define ALG_SET_IV 2