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/asm-generic/signal-defs.h b/libc/kernel/uapi/asm-generic/signal-defs.h
index f47cbe7..ad77d77 100644
--- a/libc/kernel/uapi/asm-generic/signal-defs.h
+++ b/libc/kernel/uapi/asm-generic/signal-defs.h
@@ -33,13 +33,13 @@
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #ifndef __ASSEMBLY__
 typedef void __signalfn_t(int);
-typedef __signalfn_t __user *__sighandler_t;
+typedef __signalfn_t __user * __sighandler_t;
 typedef void __restorefn_t(void);
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-typedef __restorefn_t __user *__sigrestore_t;
-#define SIG_DFL ((__force __sighandler_t)0)
-#define SIG_IGN ((__force __sighandler_t)1)
-#define SIG_ERR ((__force __sighandler_t)-1)
+typedef __restorefn_t __user * __sigrestore_t;
+#define SIG_DFL ((__force __sighandler_t) 0)
+#define SIG_IGN ((__force __sighandler_t) 1)
+#define SIG_ERR ((__force __sighandler_t) - 1)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
 #endif