#406: cmake: don't copy headers if destination folder already exists
#406: cmake: don't copy headers if destination folder already exists

vladpyslaru/libfalltergeist,falltergeist/libfalltergeist,alexeevdv/libfalltergeist,alexeevdv/libfalltergeist,alexeevdv/libfalltergeist,falltergeist/libfalltergeist,vladpyslaru/libfalltergeist