Jenkins: Force bin-pkg-config WIN stage to node with more disk

Binary package stage tends to run out of disk space. Now there is two
nodes with extra space, which are dedicated to binary pkg builds only.

Change-Id: I8b09673825a9bfe137d31f1c3e2d3e4915bd4858
Reviewed-by: Heikki Halmet <heikki.halmet@digia.com>
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@digia.com>