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/times.h b/libc/kernel/uapi/linux/times.h
index c1da8ae..d0494d7 100644
--- a/libc/kernel/uapi/linux/times.h
+++ b/libc/kernel/uapi/linux/times.h
@@ -21,10 +21,10 @@
 #include <linux/types.h>
 struct tms {
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __kernel_clock_t tms_utime;
- __kernel_clock_t tms_stime;
- __kernel_clock_t tms_cutime;
- __kernel_clock_t tms_cstime;
+  __kernel_clock_t tms_utime;
+  __kernel_clock_t tms_stime;
+  __kernel_clock_t tms_cutime;
+  __kernel_clock_t tms_cstime;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
 #endif