issues while rotated

[ramMASTER]

dont know if this is new but with the latest source (without compiling parameters) when the view is rotated all hell breaks loose:

-roads flicker verticaly and horizontaly

-mouse gets 2 positions

-ambient sounds seem to stop

also the ground marked for housing with the boards have the property "walkable" or "empty" and the road builder pathfinder chooses a path on top of them

[dalerank]

fix #339. Improved build in when map rotated.

→ <<cset 1a30382e0f74>>