Remove the constructor from OS_Classification.

This is not needed not because cpe is not a simple pointer, and I want
to be able to initialize this with curly brackets like a struct.

global_structures.h

@@ -167,13 +167,6 @@ struct OS_Classification {
   const char *OS_Generation; /* Can be NULL if unclassified */
   const char *Device_Type;
   std::vector<const char *> cpe;
-
-  OS_Classification() {
-    OS_Vendor = NULL;
-    OS_Family = NULL;
-    OS_Generation = NULL;
-    Device_Type = NULL;
-  }
 };
 
 struct FingerTest {