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/a.out.h b/libc/kernel/uapi/asm-x86/asm/a.out.h
index fa287b5..d1a4740 100644
--- a/libc/kernel/uapi/asm-x86/asm/a.out.h
+++ b/libc/kernel/uapi/asm-x86/asm/a.out.h
@@ -18,22 +18,21 @@
  ****************************************************************************/
 #ifndef _ASM_X86_A_OUT_H
 #define _ASM_X86_A_OUT_H
-struct exec
-{
+struct exec {
+  unsigned int a_info;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- unsigned int a_info;
- unsigned a_text;
- unsigned a_data;
- unsigned a_bss;
+  unsigned a_text;
+  unsigned a_data;
+  unsigned a_bss;
+  unsigned a_syms;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- unsigned a_syms;
- unsigned a_entry;
- unsigned a_trsize;
- unsigned a_drsize;
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  unsigned a_entry;
+  unsigned a_trsize;
+  unsigned a_drsize;
 };
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define N_TRSIZE(a) ((a).a_trsize)
 #define N_DRSIZE(a) ((a).a_drsize)
 #define N_SYMSIZE(a) ((a).a_syms)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */