[colm] buildprocess colm visualisation

[Peter Reijnders]

Hai

Some time ago I investigated how I the build process of colm is working.
It is not compiling and linking. Colm is bootstrapped in a clever way.
The 'main.cc' is compiled 3 times with various '-D' flags.
At that time I create this graph to get an better overview.
Please not that this is just a high level overview. Not all files
(.c, .cc, .h, .o) are name explicitly. 

Hopefully is usable for others in the future.

```
dot -Tsvg -o/tmp/buildprocess.dot.svg buildprocess.dot
```



Peter Reijnders
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