[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Linux Squeak VM X11 keyboard changes breaks 32b VM (#396)

[John Brant]

The change was made for this reason: 
```The other VM issue was that A-Z keys being pressed when the control was pressed was being reported as character code 1-26 instead of the letters a-z. On the other platforms, they are reported as letters with the control key pressed. On Linux, they were reported with the control key down, but with character codes 1-26.``` 
I only tested the change on a 64-bit Pharo image. Playing around a little with a 64-bit Squeak 5.2 image, it appears that Squeak is likely translating the character codes 1-26 specially.  I added some debugging code to `EventSensor>>fetchMoreEvents` (in the whileFalse: loop): 
```
type = EventTypeKeyboard 
    ifTrue: [Transcript show: (eventBuffer at: 3) printString , ' - ', (eventBuffer at: 5) printString; cr; flush].
```
When running with the old vm and pressing/releasing Ctrl-a, I get this printed to the transcript:
```
251 - 6
1 - 2
1 - 2
1 - 2
63 - 0
```
When running with the new vm I get:
```
251 - 6
97 - 2
97 - 2
97 - 2
251 - 0
```
The new vm generates the correct codes, but Ctrl-a isn't selecting the whole text. Watching the events using `HandMorph showEvents: true`, you can see that the image is converting the old vm's Ctrl-a into Cmd-a, but it isn't converting the new vm's Ctrl-a into Cmd-a.

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