Sort lists in CMakeLists.txt alphabetically

Change-Id: I39d1c8e280bc1d536ae0e9f36090d480ce327c45
Reviewed-on: http://review.couchbase.org/27531
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>