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/apm_bios.h b/libc/kernel/uapi/linux/apm_bios.h
index f3b6130..e6b17ad 100644
--- a/libc/kernel/uapi/linux/apm_bios.h
+++ b/libc/kernel/uapi/linux/apm_bios.h
@@ -23,17 +23,17 @@
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 typedef unsigned short apm_eventinfo_t;
 struct apm_bios_info {
- __u16 version;
- __u16 cseg;
+  __u16 version;
+  __u16 cseg;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __u32 offset;
- __u16 cseg_16;
- __u16 dseg;
- __u16 flags;
+  __u32 offset;
+  __u16 cseg_16;
+  __u16 dseg;
+  __u16 flags;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __u16 cseg_len;
- __u16 cseg_16_len;
- __u16 dseg_len;
+  __u16 cseg_len;
+  __u16 cseg_16_len;
+  __u16 dseg_len;
 };
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define APM_STATE_READY 0x0000