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/sembuf.h b/libc/kernel/uapi/asm-generic/sembuf.h
index bcf1702..1cc4e32 100644
--- a/libc/kernel/uapi/asm-generic/sembuf.h
+++ b/libc/kernel/uapi/asm-generic/sembuf.h
@@ -21,20 +21,20 @@
 #include <asm/bitsperlong.h>
 struct semid64_ds {
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- struct ipc64_perm sem_perm;
- __kernel_time_t sem_otime;
+  struct ipc64_perm sem_perm;
+  __kernel_time_t sem_otime;
 #if __BITS_PER_LONG != 64
- unsigned long __unused1;
+  unsigned long __unused1;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
- __kernel_time_t sem_ctime;
+  __kernel_time_t sem_ctime;
 #if __BITS_PER_LONG != 64
- unsigned long __unused2;
+  unsigned long __unused2;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
- unsigned long sem_nsems;
- unsigned long __unused3;
- unsigned long __unused4;
+  unsigned long sem_nsems;
+  unsigned long __unused3;
+  unsigned long __unused4;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
 #endif