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-x86/asm/signal.h b/libc/kernel/uapi/asm-x86/asm/signal.h
index 308c7a9..dba268f 100644
--- a/libc/kernel/uapi/asm-x86/asm/signal.h
+++ b/libc/kernel/uapi/asm-x86/asm/signal.h
@@ -93,33 +93,33 @@
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #ifdef __i386__
 struct sigaction {
- union {
- __sighandler_t _sa_handler;
+  union {
+    __sighandler_t _sa_handler;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- void (*_sa_sigaction)(int, struct siginfo *, void *);
- } _u;
- sigset_t sa_mask;
- unsigned long sa_flags;
+    void(* _sa_sigaction) (int, struct siginfo *, void *);
+  } _u;
+  sigset_t sa_mask;
+  unsigned long sa_flags;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- void (*sa_restorer)(void);
+  void(* sa_restorer) (void);
 };
 #define sa_handler _u._sa_handler
 #define sa_sigaction _u._sa_sigaction
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #else
 struct sigaction {
- __sighandler_t sa_handler;
- unsigned long sa_flags;
+  __sighandler_t sa_handler;
+  unsigned long sa_flags;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __sigrestore_t sa_restorer;
- sigset_t sa_mask;
+  __sigrestore_t sa_restorer;
+  sigset_t sa_mask;
 };
 #endif
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 typedef struct sigaltstack {
- void __user *ss_sp;
- int ss_flags;
- size_t ss_size;
+  void __user * ss_sp;
+  int ss_flags;
+  size_t ss_size;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 } stack_t;
 #endif