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/dlmconstants.h b/libc/kernel/uapi/linux/dlmconstants.h
index e24d42c..4771d92 100644
--- a/libc/kernel/uapi/linux/dlmconstants.h
+++ b/libc/kernel/uapi/linux/dlmconstants.h
@@ -21,7 +21,7 @@
 #define DLM_LOCKSPACE_LEN 64
 #define DLM_RESNAME_MAXLEN 64
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define DLM_LOCK_IV (-1)
+#define DLM_LOCK_IV (- 1)
 #define DLM_LOCK_NL 0
 #define DLM_LOCK_CR 1
 #define DLM_LOCK_CW 2