Improve header dependency test builds in the case of not building all of osvr-core
Improve header dependency test builds in the case of not building all of osvr-core

godbyk/OSVR-Core,feilen/OSVR-Core,Armada651/OSVR-Core,OSVR/OSVR-Core,d235j/OSVR-Core,Armada651/OSVR-Core,godbyk/OSVR-Core,Armada651/OSVR-Core,leemichaelRazer/OSVR-Core,feilen/OSVR-Core,d235j/OSVR-Core,Armada651/OSVR-Core,OSVR/OSVR-Core,d235j/OSVR-Core,feilen/OSVR-Core,OSVR/OSVR-Core,feilen/OSVR-Core,leemichaelRazer/OSVR-Core,Armada651/OSVR-Core,d235j/OSVR-Core,OSVR/OSVR-Core,godbyk/OSVR-Core,godbyk/OSVR-Core,feilen/OSVR-Core,leemichaelRazer/OSVR-Core,leemichaelRazer/OSVR-Core,d235j/OSVR-Core,leemichaelRazer/OSVR-Core,godbyk/OSVR-Core,godbyk/OSVR-Core,OSVR/OSVR-Core,OSVR/OSVR-Core