Fix for logical and syntactical errors in libcudf c++ examples

cpp/examples/basic/src/process_csv.cpp

@@ -93,7 +93,7 @@ int main(int argc, char** argv)
   rmm::mr::set_current_device_resource(&mr);
 
   // for testing the CI.
-  i_am_a_dummy_compile_time_error;
+  #error "Force compilation error to test CI"
 
   // Read data
   auto stock_table_with_metadata = read_csv("4stock_5day.csv");