message: Fix an issue with the definition of MFEM_GIT_STRING in CMakeLists.txt
diff: @@ -100,13 +100,13 @@ mfem_version_to_int(${${PROJECT_NAME}_VERSION} ${PROJECT_NAME_UC}_VERSION)
  set(${PROJECT_NAME_UC}_VERSION_STRING ${${PROJECT_NAME}_VERSION})
  if (EXISTS ${PROJECT_SOURCE_DIR}/.git)
  execute_process(
  - COMMAND git -C ${PROJECT_SOURCE_DIR}
  - describe --all --long --abbrev=40 --dirty --always
  + COMMAND git describe --all --long --abbrev=40 --dirty --always
  + WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"
  OUTPUT_VARIABLE ${PROJECT_NAME_UC}_GIT_STRING
  ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
  endif()
  if (NOT ${PROJECT_NAME_UC}_GIT_STRING)
  - set(${PROJECT_NAME_UC}_GIT_STRING "")
  + set(${PROJECT_NAME_UC}_GIT_STRING "(unknown)")
  endif()
  #-------------------------------------------------------------------------------
  