Show "debug build" on the splash screen, in debug builds.

UI/MiscScreens.cpp

@@ -516,6 +516,9 @@ void LogoScreen::render() {
 #if (defined(_WIN32) && !PPSSPP_PLATFORM(UWP)) || PPSSPP_PLATFORM(ANDROID) || PPSSPP_PLATFORM(LINUX)
 	// Draw the graphics API, except on UWP where it's always D3D11
 	std::string apiName = screenManager()->getDrawContext()->GetInfoString(InfoField::APINAME);
+#ifdef _DEBUG
+	apiName += ", debug build";
+#endif
 	dc.DrawText(gr->T(apiName), bounds.centerX(), ppsspp_org_y + 50, textColor, ALIGN_CENTER);
 #endif