Add back printf.

Author: tortugaveloz

src/port/GBIMiddleware.cpp

@@ -61,6 +61,7 @@ extern "C" void gSPDisplayList(Gfx* pkt, Gfx* dl) {
         auto res = std::static_pointer_cast<Fast::DisplayList>(resource);
         dl = &res->Instructions[0];
 #ifdef USE_GBI_TRACE
+        printf("DisplayList: %s\n", imgData);
         for (int i = 0; i < res->Instructions.size(); i++) {
             auto gfx = &res->Instructions[i];
             gfx->words.trace.file = imgData;