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/linux/fiemap.h b/libc/kernel/uapi/linux/fiemap.h
index e4b46c2..d41a87d 100644
--- a/libc/kernel/uapi/linux/fiemap.h
+++ b/libc/kernel/uapi/linux/fiemap.h
@@ -21,24 +21,24 @@
 #include <linux/types.h>
 struct fiemap_extent {
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __u64 fe_logical;
- __u64 fe_physical;
- __u64 fe_length;
- __u64 fe_reserved64[2];
+  __u64 fe_logical;
+  __u64 fe_physical;
+  __u64 fe_length;
+  __u64 fe_reserved64[2];
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __u32 fe_flags;
- __u32 fe_reserved[3];
+  __u32 fe_flags;
+  __u32 fe_reserved[3];
 };
 struct fiemap {
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __u64 fm_start;
- __u64 fm_length;
- __u32 fm_flags;
- __u32 fm_mapped_extents;
+  __u64 fm_start;
+  __u64 fm_length;
+  __u32 fm_flags;
+  __u32 fm_mapped_extents;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __u32 fm_extent_count;
- __u32 fm_reserved;
- struct fiemap_extent fm_extents[0];
+  __u32 fm_extent_count;
+  __u32 fm_reserved;
+  struct fiemap_extent fm_extents[0];
 };
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define FIEMAP_MAX_OFFSET (~0ULL)