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/ioprio.h b/libc/kernel/uapi/linux/ioprio.h
index ccdb3b0..5886e77 100644
--- a/libc/kernel/uapi/linux/ioprio.h
+++ b/libc/kernel/uapi/linux/ioprio.h
@@ -24,22 +24,22 @@
 #define IOPRIO_PRIO_MASK ((1UL << IOPRIO_CLASS_SHIFT) - 1)
 #define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT)
 #define IOPRIO_PRIO_DATA(mask) ((mask) & IOPRIO_PRIO_MASK)
-#define IOPRIO_PRIO_VALUE(class, data) (((class) << IOPRIO_CLASS_SHIFT) | data)
+#define IOPRIO_PRIO_VALUE(class,data) (((class) << IOPRIO_CLASS_SHIFT) | data)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ioprio_valid(mask) (IOPRIO_PRIO_CLASS((mask)) != IOPRIO_CLASS_NONE)
 enum {
- IOPRIO_CLASS_NONE,
- IOPRIO_CLASS_RT,
+  IOPRIO_CLASS_NONE,
+  IOPRIO_CLASS_RT,
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- IOPRIO_CLASS_BE,
- IOPRIO_CLASS_IDLE,
+  IOPRIO_CLASS_BE,
+  IOPRIO_CLASS_IDLE,
 };
 #define IOPRIO_BE_NR (8)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 enum {
- IOPRIO_WHO_PROCESS = 1,
- IOPRIO_WHO_PGRP,
- IOPRIO_WHO_USER,
+  IOPRIO_WHO_PROCESS = 1,
+  IOPRIO_WHO_PGRP,
+  IOPRIO_WHO_USER,
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
 #define IOPRIO_NORM (4)