Update sample.json

Author: jimmytwei

DirectProgramming/C++/CompilerInfrastructure/OpenMP_Offload_Features/sample.json

@@ -20,6 +20,7 @@
           "make run_prog1",
           "make run_prog2",
           "make run_prog3",
+          "make run_prog4",
           "make clean"
         ]
       }