ndb - 5.1.2 build fix: Signal syms in test pgms on hp3750

storage/ndb/src/kernel/blocks/dbtup/test_varpage.cpp:
  add some Signal syms to test programs for hp3750, hope it dont break other platforms..
storage/ndb/src/kernel/blocks/print_file.cpp:
  add some Signal syms to test programs for hp3750, hope it dont break other platforms..

storage/ndb/src/kernel/blocks/dbtup/test_varpage.cpp

@@ -123,3 +123,7 @@ main(void)
 }
 
 template class Vector<Record>;
+
+// hp3750
+struct Signal { Signal(); int foo; };
+Signal::Signal(){}

storage/ndb/src/kernel/blocks/print_file.cpp

@@ -368,3 +368,6 @@ print_undo_page(int count, void* ptr, Uint32 sz){
 
   return 0;
 }
+
+// hp3750
+Signal::Signal(){}