idt: update sources for API changes

Author: compnerd

Sources/idt/idt.cc

@@ -127,7 +127,7 @@ class visitor : public clang::RecursiveASTVisitor<visitor> {
       }
 
       // Pure virtual methods cannot be exported.
-      if (MD->isPure())
+      if (MD->isPureVirtual())
         return true;
     }