include: fix typedefs

Use what was in the upstream header.  The switch of XGL_SIZE to size_t
generates quite some warnings and is fixed.
diff --git a/tests/xgltestframework.cpp b/tests/xgltestframework.cpp
index f5d03ea..889e655 100644
--- a/tests/xgltestframework.cpp
+++ b/tests/xgltestframework.cpp
@@ -214,7 +214,7 @@
         XGL_IMAGE_ASPECT_COLOR, 0, 0
     };
     XGL_SUBRESOURCE_LAYOUT sr_layout;
-    XGL_UINT data_size = sizeof(sr_layout);
+    size_t data_size = sizeof(sr_layout);
 
     err = xglGetImageSubresourceInfo( image->image(), &sr,
                                       XGL_INFO_TYPE_SUBRESOURCE_LAYOUT,
@@ -331,7 +331,7 @@
         XGL_IMAGE_ASPECT_COLOR, 0, 0
     };
     XGL_SUBRESOURCE_LAYOUT sr_layout;
-    XGL_UINT data_size = sizeof(sr_layout);
+    size_t data_size = sizeof(sr_layout);
 
     if (!m_show_images) return;