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/sembuf.h b/libc/kernel/uapi/asm-x86/asm/sembuf.h
index 41d3b2a..b7c0dbe 100644
--- a/libc/kernel/uapi/asm-x86/asm/sembuf.h
+++ b/libc/kernel/uapi/asm-x86/asm/sembuf.h
@@ -19,16 +19,16 @@
 #ifndef _ASM_X86_SEMBUF_H
 #define _ASM_X86_SEMBUF_H
 struct semid64_ds {
- struct ipc64_perm sem_perm;
+  struct ipc64_perm sem_perm;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __kernel_time_t sem_otime;
- __kernel_ulong_t __unused1;
- __kernel_time_t sem_ctime;
- __kernel_ulong_t __unused2;
+  __kernel_time_t sem_otime;
+  __kernel_ulong_t __unused1;
+  __kernel_time_t sem_ctime;
+  __kernel_ulong_t __unused2;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __kernel_ulong_t sem_nsems;
- __kernel_ulong_t __unused3;
- __kernel_ulong_t __unused4;
+  __kernel_ulong_t sem_nsems;
+  __kernel_ulong_t __unused3;
+  __kernel_ulong_t __unused4;
 };
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif