The explicit initialization with empty paths from commit 57bdc1a2f7
(cmState: Compute and store directory components., 2015-05-04,
v3.3.0-rc1~61^2~4) has not been needed since commit 6afd35b98a (cmState:
remove unused code, 2016-06-16, v3.7.0-rc1~90^2).
4a2d32e7c4
