[Coco] Linux ovcc: need AGAR source code

[Michael Furman]

Walter,

Can you publish a copy of your AGAR source changes?

I hacked away and got to a point where the include files for the modified libagar seem to be required:

```vccgui.c:1755:9: error: use of undeclared identifier 'AG_WIDGET_USE_DRAWN'; did you mean 'AG_WIDGET_PERCENT'?
        AG_WIDGET_USE_DRAWN;
        ^~~~~~~~~~~~~~~~~~~
        AG_WIDGET_PERCENT
/usr/local/Cellar/libagar/1.5.0_1/include/agar/agar/gui/widget.h:46:2: note: 'AG_WIDGET_PERCENT' declared here
        AG_WIDGET_PERCENT,              /* % of available space */
        ^
```

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