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/ptrace.h b/libc/kernel/uapi/linux/ptrace.h
index 6f71b6d..a3244e9 100644
--- a/libc/kernel/uapi/linux/ptrace.h
+++ b/libc/kernel/uapi/linux/ptrace.h
@@ -49,10 +49,10 @@
 #define PTRACE_LISTEN 0x4208
 #define PTRACE_PEEKSIGINFO 0x4209
 struct ptrace_peeksiginfo_args {
- __u64 off;
+  __u64 off;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __u32 flags;
- __s32 nr;
+  __u32 flags;
+  __s32 nr;
 };
 #define PTRACE_GETSIGMASK 0x420a
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */