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/ipcbuf.h b/libc/kernel/uapi/asm-generic/ipcbuf.h
index cc7274e..b16f729 100644
--- a/libc/kernel/uapi/asm-generic/ipcbuf.h
+++ b/libc/kernel/uapi/asm-generic/ipcbuf.h
@@ -19,20 +19,20 @@
 #ifndef __ASM_GENERIC_IPCBUF_H
 #define __ASM_GENERIC_IPCBUF_H
 struct ipc64_perm {
- __kernel_key_t key;
+  __kernel_key_t key;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __kernel_uid32_t uid;
- __kernel_gid32_t gid;
- __kernel_uid32_t cuid;
- __kernel_gid32_t cgid;
+  __kernel_uid32_t uid;
+  __kernel_gid32_t gid;
+  __kernel_uid32_t cuid;
+  __kernel_gid32_t cgid;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __kernel_mode_t mode;
- unsigned char __pad1[4 - sizeof(__kernel_mode_t)];
- unsigned short seq;
- unsigned short __pad2;
+  __kernel_mode_t mode;
+  unsigned char __pad1[4 - sizeof(__kernel_mode_t)];
+  unsigned short seq;
+  unsigned short __pad2;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __kernel_ulong_t __unused1;
- __kernel_ulong_t __unused2;
+  __kernel_ulong_t __unused1;
+  __kernel_ulong_t __unused2;
 };
 #endif
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */