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_pppolac.h b/libc/kernel/uapi/linux/if_pppolac.h
index 84a1499..303a899 100644
--- a/libc/kernel/uapi/linux/if_pppolac.h
+++ b/libc/kernel/uapi/linux/if_pppolac.h
@@ -22,13 +22,13 @@
 #include <linux/types.h>
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct sockaddr_pppolac {
- sa_family_t sa_family;
- unsigned int sa_protocol;
- int udp_socket;
+  sa_family_t sa_family;
+  unsigned int sa_protocol;
+  int udp_socket;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- struct __attribute__((packed)) {
- __u16 tunnel, session;
- } local, remote;
+  struct __attribute__((packed)) {
+    __u16 tunnel, session;
+  } local, remote;
 } __attribute__((packed));
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif