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/nfsd/stats.h b/libc/kernel/uapi/linux/nfsd/stats.h
index 757b7d7..3c49bbc 100644
--- a/libc/kernel/uapi/linux/nfsd/stats.h
+++ b/libc/kernel/uapi/linux/nfsd/stats.h
@@ -19,6 +19,6 @@
 #ifndef _UAPILINUX_NFSD_STATS_H
 #define _UAPILINUX_NFSD_STATS_H
 #include <linux/nfs4.h>
-#define NFSD_USAGE_WRAP (HZ*1000000)
+#define NFSD_USAGE_WRAP (HZ * 1000000)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif