Added support for precompiling stdtest.h
Added support for precompiling stdtest.h

dgruss/ustl,msharov/ustl,uusirant/ustl-cmake,Gerii/ustl,NoSuchProcess/ustl,PetteriAimonen/ustl,szastupov/ustl,dgruss/ustl,uusirant/ustl-cmake,PetteriAimonen/ustl,PetteriAimonen/ustl,NoSuchProcess/ustl,szastupov/ustl,msharov/ustl,Gerii/ustl