Change filename in CMakeLists.txt file to match previous commits changes.
Change filename in CMakeLists.txt file to match previous commits changes.

cellml/libcellml,nickerso/libcellml,libcellml/buildbot-testing,hsorby/libcellml,hsorby/libcellml,libcellml/buildbot-testing,MichaelClerx/libcellml,nickerso/libcellml,nickerso/libcellml,MichaelClerx/libcellml,nickerso/libcellml,hsorby/libcellml,cellml/libcellml,cellml/libcellml,cellml/libcellml,MichaelClerx/libcellml,hsorby/libcellml