[openbeos] Links port

Hi there,
I updated the Links port to BeOS, and added gui code inspired by the 
AtheOS version. The R5 bone build works fine on Haiku:

http://revolf.free.fr/beos/shots/shot_links_haiku_003.png

http://revolf.free.fr/beos/links-beos-bin.zip

- It's a bit slow (need to remove the now useless BLocker) but 
workable.
- Missing jpg support (just didn't have an R5 compatible lib handy).
- scrolling not implemented yet (just force a redraw after scrolling).

Hope it will help waiting for WebKit ;)

François.

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