jet40: fix installation on win64

This fixes #920

jet40 needs mdac, but mdac27 doesn't support win64, so use mdac28 instead.

src/winetricks

@@ -8142,7 +8142,12 @@ w_metadata jet40 dlls \
 
 load_jet40()
 {
-    w_call mdac27
+    # mdac27 is 32-bit only, so use mdac28 for win64:
+    if [ "$W_ARCH" = "win64" ] ; then
+        w_call mdac28
+    else
+        w_call mdac27
+    fi
     w_call wsh57
 
     # https://support.microsoft.com/kb/239114