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-mips/asm/sembuf.h b/libc/kernel/uapi/asm-mips/asm/sembuf.h
index b524f68..0a8d4d9 100644
--- a/libc/kernel/uapi/asm-mips/asm/sembuf.h
+++ b/libc/kernel/uapi/asm-mips/asm/sembuf.h
@@ -19,13 +19,13 @@
 #ifndef _ASM_SEMBUF_H
 #define _ASM_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_time_t sem_ctime;
- unsigned long sem_nsems;
- unsigned long __unused1;
+  __kernel_time_t sem_otime;
+  __kernel_time_t sem_ctime;
+  unsigned long sem_nsems;
+  unsigned long __unused1;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- unsigned long __unused2;
+  unsigned long __unused2;
 };
 #endif