added check for WP8_SHADER_COMPILER

cocos/platform/winrt/CCDevice.cpp

@@ -45,6 +45,8 @@ int Device::getDPI()
 #if CC_TARGET_PLATFORM == CC_PLATFORM_WP8
 	static const float dipsPerInch = 96.0f;
 	return floor(DisplayProperties::LogicalDpi / dipsPerInch + 0.5f); // Round to nearest integer.
+#elif defined WP8_SHADER_COMPILER
+    return 0;
 #else
     return cocos2d::GLViewImpl::sharedOpenGLView()->GetDPI();
 #endif