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/can/raw.h b/libc/kernel/uapi/linux/can/raw.h
index 77cce9b..a70d881 100644
--- a/libc/kernel/uapi/linux/can/raw.h
+++ b/libc/kernel/uapi/linux/can/raw.h
@@ -22,12 +22,12 @@
 #define SOL_CAN_RAW (SOL_CAN_BASE + CAN_RAW)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 enum {
- CAN_RAW_FILTER = 1,
- CAN_RAW_ERR_FILTER,
- CAN_RAW_LOOPBACK,
+  CAN_RAW_FILTER = 1,
+  CAN_RAW_ERR_FILTER,
+  CAN_RAW_LOOPBACK,
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- CAN_RAW_RECV_OWN_MSGS,
- CAN_RAW_FD_FRAMES,
+  CAN_RAW_RECV_OWN_MSGS,
+  CAN_RAW_FD_FRAMES,
 };
 #endif
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */