#159 Motif: keybindings interfere w/ menu accels

[Stefan Ulrich]

In Motif, the keys bound to menu accelerators also
invoke the ordinary bindings of these keys. To reproduce:

- Go to the last page of a document
- Activate `Zoom' via Alt-z
- Hit `f' (for `fit in window')

This will both invoke `fit in window' and the ordinary
binding `forward-page'; the latter is not intended.

[Stefan Ulrich]

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user_id=177175

Fixed 22.76.2-RC1 by adding ~Alt to the key bindings that
are also used as Menu accelerators.