dummy env to force cmake void package into db install

envs/specific/m100/0021_other_cmake/spack.yaml

+spack:
+  definitions:
+  - cmake:
+    - cmake 
+  - compilers:
+    - '%gcc@8.4.0'
+    - '%xl@16.1.1'
+    - '%pgi@19.10'
+  specs:
+  - matrix:
+    - [$cmake]
+    - [$compilers]
+
+  view: false