Adding missing boost filesystem to CMakeLists.

6 jobs for master in 13 minutes and 49 seconds (queued for 6 seconds)
Status Name Job ID Coverage
  Build
passed centos_build #17862
centos

00:05:03

passed mac_build #17863
mac

00:10:48

passed ubuntu_build #17864
ubuntu

00:04:27

 
  Test
passed centos_run #17865
centos

00:00:01

passed mac_run #17866
mac

00:00:07

passed ubuntu_run #17867
ubuntu

00:00:01