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/asm-x86/asm/vsyscall.h b/libc/kernel/uapi/asm-x86/asm/vsyscall.h
index d010af9..95bf2ca 100644
--- a/libc/kernel/uapi/asm-x86/asm/vsyscall.h
+++ b/libc/kernel/uapi/asm-x86/asm/vsyscall.h
@@ -19,11 +19,11 @@
 #ifndef _UAPI_ASM_X86_VSYSCALL_H
 #define _UAPI_ASM_X86_VSYSCALL_H
 enum vsyscall_num {
- __NR_vgettimeofday,
+  __NR_vgettimeofday,
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
- __NR_vtime,
- __NR_vgetcpu,
+  __NR_vtime,
+  __NR_vgetcpu,
 };
-#define VSYSCALL_ADDR (-10UL << 20)
+#define VSYSCALL_ADDR (- 10UL << 20)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif