remove guards for building with vtkm 1.9

examples/gray-scott/CMakeLists.txt

examples/reader_writer/CMakeLists.txt

examples/xgc/CMakeLists.txt

fides/Array.cxx

fides/CMakeLists.txt

tests/CMakeLists.txt

tests/test-basic.cxx

tests/test-composite.cxx

tests/test-groups.cxx

tests/test-inline.cxx

tests/test-streaming-separate-sources.cxx

tests/test-streaming.cxx

tests/test-time.cxx