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_slip.h b/libc/kernel/uapi/linux/if_slip.h
index 7863f2c..8cd714e 100644
--- a/libc/kernel/uapi/linux/if_slip.h
+++ b/libc/kernel/uapi/linux/if_slip.h
@@ -26,10 +26,10 @@
 #define SL_OPT_ADAPTIVE 8
 #define SIOCSKEEPALIVE (SIOCDEVPRIVATE)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define SIOCGKEEPALIVE (SIOCDEVPRIVATE+1)
-#define SIOCSOUTFILL (SIOCDEVPRIVATE+2)
-#define SIOCGOUTFILL (SIOCDEVPRIVATE+3)
-#define SIOCSLEASE (SIOCDEVPRIVATE+4)
+#define SIOCGKEEPALIVE (SIOCDEVPRIVATE + 1)
+#define SIOCSOUTFILL (SIOCDEVPRIVATE + 2)
+#define SIOCGOUTFILL (SIOCDEVPRIVATE + 3)
+#define SIOCSLEASE (SIOCDEVPRIVATE + 4)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define SIOCGLEASE (SIOCDEVPRIVATE+5)
+#define SIOCGLEASE (SIOCDEVPRIVATE + 5)
 #endif