gdiplus: Avoid implicit enum casts.

dlls/gdiplus/image.c

@@ -6066,7 +6066,7 @@ GpStatus WINGDIPAPI GdipInitializePalette(ColorPalette *palette,
         ColorPalette *wic_palette;
         GpStatus status = Ok;
 
-        wic_palette = get_palette(NULL, type);
+        wic_palette = get_palette(NULL, (WICBitmapPaletteType)type);
         if (!wic_palette) return OutOfMemory;
 
         if (palette->Count >= wic_palette->Count)

dlls/gdiplus/metafile.c

@@ -4531,7 +4531,7 @@ GpStatus WINGDIPAPI GdipRecordMetafileFileName(GDIPCONST WCHAR* fileName,
     (*metafile)->bounds.X = (*metafile)->bounds.Y = 0.0;
     (*metafile)->bounds.Width = (*metafile)->bounds.Height = 1.0;
     (*metafile)->unit = UnitPixel;
-    (*metafile)->metafile_type = type;
+    (*metafile)->metafile_type = (MetafileType)type;
     (*metafile)->record_dc = record_dc;
     (*metafile)->comment_data = NULL;
     (*metafile)->comment_data_size = 0;