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/atm_eni.h b/libc/kernel/uapi/linux/atm_eni.h
index 950a8a0..a658d64 100644
--- a/libc/kernel/uapi/linux/atm_eni.h
+++ b/libc/kernel/uapi/linux/atm_eni.h
@@ -21,9 +21,9 @@
 #include <linux/atmioc.h>
 struct eni_multipliers {
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- int tx,rx;
+  int tx, rx;
 };
-#define ENI_MEMDUMP _IOW('a',ATMIOC_SARPRV,struct atmif_sioc)
-#define ENI_SETMULT _IOW('a',ATMIOC_SARPRV+7,struct atmif_sioc)
+#define ENI_MEMDUMP _IOW('a', ATMIOC_SARPRV, struct atmif_sioc)
+#define ENI_SETMULT _IOW('a', ATMIOC_SARPRV + 7, struct atmif_sioc)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif