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/watchdog.h b/libc/kernel/uapi/linux/watchdog.h
index 05a9bc8..b8a9c32 100644
--- a/libc/kernel/uapi/linux/watchdog.h
+++ b/libc/kernel/uapi/linux/watchdog.h
@@ -23,10 +23,10 @@
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define WATCHDOG_IOCTL_BASE 'W'
 struct watchdog_info {
- __u32 options;
- __u32 firmware_version;
+  __u32 options;
+  __u32 firmware_version;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __u8 identity[32];
+  __u8 identity[32];
 };
 #define WDIOC_GETSUPPORT _IOR(WATCHDOG_IOCTL_BASE, 0, struct watchdog_info)
 #define WDIOC_GETSTATUS _IOR(WATCHDOG_IOCTL_BASE, 1, int)
@@ -42,8 +42,8 @@
 #define WDIOC_GETPRETIMEOUT _IOR(WATCHDOG_IOCTL_BASE, 9, int)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define WDIOC_GETTIMELEFT _IOR(WATCHDOG_IOCTL_BASE, 10, int)
-#define WDIOF_UNKNOWN -1
-#define WDIOS_UNKNOWN -1
+#define WDIOF_UNKNOWN - 1
+#define WDIOS_UNKNOWN - 1
 #define WDIOF_OVERHEAT 0x0001
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define WDIOF_FANFAULT 0x0002