Added more explicit debug var print

src/goodbyedpi.c

@@ -574,6 +574,7 @@ static void send_native_fragment(HANDLE w_filter, WINDIVERT_ADDRESS addr,
 }
 
 int main(int argc, char *argv[]) {
+    printf("Debug mode is %s",getenv("DEBUG_GDPI"));
     debug("Debug mode enabled");
     static enum packet_type_e {
         unknown,