remove tlm/cmakefile.txt reference

Change-Id: Id51ebbd3983e817b5214dc39ba13eefd15e265dc
Reviewed-on: http://review.couchbase.org/28800
Reviewed-by: David Liao <david.liao@couchbase.com>
Tested-by: David Liao <david.liao@couchbase.com>