Currently we run into lots of race conditions when building in
multithreded mode.

Reported-by: Mr Jenkins
Signed-off-by: Ruslan Kuprieiev <kupruser@gmail.com>
Acked-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>