message: install examples if enabled
  I don't think this has other significant side effects...
diff: @@ -550,7 +550,11 @@ add_custom_target(${MFEM_EXEC_PREREQUISITES_TARGET_NAME})
  # Create a target for all examples and, optionally, enable it.
  set(MFEM_ALL_EXAMPLES_TARGET_NAME examples)
  add_mfem_target(${MFEM_ALL_EXAMPLES_TARGET_NAME} ${MFEM_ENABLE_EXAMPLES})
  +if (MFEM_ENABLE_EXAMPLES)
  + add_subdirectory(examples) #install examples if enabled
  +else()
  add_subdirectory(examples EXCLUDE_FROM_ALL)
  +endif()
  # Create a target for all miniapps and, optionally, enable it.
  set(MFEM_ALL_MINIAPPS_TARGET_NAME miniapps)
  