internal/pathutil: remove CMakeLists.txt mark on rootMarks
internal/pathutil: remove CMakeLists.txt mark on rootMarks

CMakeLists.txt file is sometimes exist not root directory

Signed-off-by: Koichi Shiraishi <2e5bdfebde234ed3509bcfc18121c70b6631e207@gmail.com>

zchee/clang-server,zchee/clang-server