Vagrant: Add missing xcsoar build dependencies.
Vagrant: Add missing xcsoar build dependencies.

skylines-project/skylines,shadowoneau/skylines,TobiasLohner/SkyLines,Harry-R/skylines,Turbo87/skylines,skylines-project/skylines,shadowoneau/skylines,TobiasLohner/SkyLines,kerel-fs/skylines,Harry-R/skylines,Harry-R/skylines,Turbo87/skylines,Turbo87/skylines,skylines-project/skylines,shadowoneau/skylines,Turbo87/skylines,Harry-R/skylines,RBE-Avionik/skylines,skylines-project/skylines,kerel-fs/skylines,RBE-Avionik/skylines,RBE-Avionik/skylines,RBE-Avionik/skylines,TobiasLohner/SkyLines,shadowoneau/skylines,kerel-fs/skylines