server: Make the mapping base address a client_ptr_t instead of a void pointer.
diff --git a/server/protocol.def b/server/protocol.def
index 962446a..25dc626 100644
--- a/server/protocol.def
+++ b/server/protocol.def
@@ -1369,7 +1369,7 @@
     mem_size_t   size;          /* mapping size */
     int          protect;       /* protection flags */
     int          header_size;   /* header size (for VPROT_IMAGE mapping) */
-    void*        base;          /* default base addr (for VPROT_IMAGE mapping) */
+    client_ptr_t base;          /* default base addr (for VPROT_IMAGE mapping) */
     obj_handle_t mapping;       /* duplicate mapping handle unless removable */
     obj_handle_t shared_file;   /* shared mapping file handle */
 @END