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/xen/gntdev.h b/libc/kernel/uapi/xen/gntdev.h
index 28a2a3a..c00e5ab 100644
--- a/libc/kernel/uapi/xen/gntdev.h
+++ b/libc/kernel/uapi/xen/gntdev.h
@@ -19,46 +19,46 @@
 #ifndef __LINUX_PUBLIC_GNTDEV_H__
 #define __LINUX_PUBLIC_GNTDEV_H__
 struct ioctl_gntdev_grant_ref {
- uint32_t domid;
+  uint32_t domid;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- uint32_t ref;
+  uint32_t ref;
 };
-#define IOCTL_GNTDEV_MAP_GRANT_REF  _IOC(_IOC_NONE, 'G', 0, sizeof(struct ioctl_gntdev_map_grant_ref))
+#define IOCTL_GNTDEV_MAP_GRANT_REF _IOC(_IOC_NONE, 'G', 0, sizeof(struct ioctl_gntdev_map_grant_ref))
 struct ioctl_gntdev_map_grant_ref {
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- uint32_t count;
- uint32_t pad;
- uint64_t index;
- struct ioctl_gntdev_grant_ref refs[1];
+  uint32_t count;
+  uint32_t pad;
+  uint64_t index;
+  struct ioctl_gntdev_grant_ref refs[1];
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
-#define IOCTL_GNTDEV_UNMAP_GRANT_REF  _IOC(_IOC_NONE, 'G', 1, sizeof(struct ioctl_gntdev_unmap_grant_ref))
+#define IOCTL_GNTDEV_UNMAP_GRANT_REF _IOC(_IOC_NONE, 'G', 1, sizeof(struct ioctl_gntdev_unmap_grant_ref))
 struct ioctl_gntdev_unmap_grant_ref {
- uint64_t index;
+  uint64_t index;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- uint32_t count;
- uint32_t pad;
+  uint32_t count;
+  uint32_t pad;
 };
-#define IOCTL_GNTDEV_GET_OFFSET_FOR_VADDR  _IOC(_IOC_NONE, 'G', 2, sizeof(struct ioctl_gntdev_get_offset_for_vaddr))
+#define IOCTL_GNTDEV_GET_OFFSET_FOR_VADDR _IOC(_IOC_NONE, 'G', 2, sizeof(struct ioctl_gntdev_get_offset_for_vaddr))
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct ioctl_gntdev_get_offset_for_vaddr {
- uint64_t vaddr;
- uint64_t offset;
- uint32_t count;
+  uint64_t vaddr;
+  uint64_t offset;
+  uint32_t count;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- uint32_t pad;
+  uint32_t pad;
 };
-#define IOCTL_GNTDEV_SET_MAX_GRANTS  _IOC(_IOC_NONE, 'G', 3, sizeof(struct ioctl_gntdev_set_max_grants))
+#define IOCTL_GNTDEV_SET_MAX_GRANTS _IOC(_IOC_NONE, 'G', 3, sizeof(struct ioctl_gntdev_set_max_grants))
 struct ioctl_gntdev_set_max_grants {
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- uint32_t count;
+  uint32_t count;
 };
-#define IOCTL_GNTDEV_SET_UNMAP_NOTIFY  _IOC(_IOC_NONE, 'G', 7, sizeof(struct ioctl_gntdev_unmap_notify))
+#define IOCTL_GNTDEV_SET_UNMAP_NOTIFY _IOC(_IOC_NONE, 'G', 7, sizeof(struct ioctl_gntdev_unmap_notify))
 struct ioctl_gntdev_unmap_notify {
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- uint64_t index;
- uint32_t action;
- uint32_t event_channel_port;
+  uint64_t index;
+  uint32_t action;
+  uint32_t event_channel_port;
 };
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define UNMAP_NOTIFY_CLEAR_BYTE 0x1