Allocate palette objects on the large gdi heap.

objects/gdiobj.c

diff --git a/objects/gdiobj.c b/objects/gdiobj.c
index f08b85e..85d6779 100644
--- a/objects/gdiobj.c
+++ b/objects/gdiobj.c
@@ -693,6 +693,7 @@
     case ENHMETAFILE_MAGIC:
     case ENHMETAFILE_DC_MAGIC:
     case BITMAP_MAGIC:
+    case PALETTE_MAGIC:
         if (!(obj = alloc_large_heap( size, handle ))) goto error;
         break;
     }