One more minor cmake cleanup

common/cmake_modules/GncAddTest.cmake

@@ -73,8 +73,8 @@ function(gnc_add_test _TARGET _SOURCE_FILES TEST_INCLUDE_VAR_NAME TEST_LIBS_VAR_
   target_link_libraries(${_TARGET} ${TEST_LIBS})
   target_include_directories(${_TARGET} PRIVATE ${TEST_INCLUDE_DIRS})
   if (${HAVE_ENV_VARS})
-    set(CMAKE_COMMAND_TMP ${CMAKE_COMMAND} -E env "GNC_UNINSTALLED=YES;GNC_BUILDDIR=${CMAKE_BINARY_DIR};${ARGN}")
-    add_test(${_TARGET} ${CMAKE_COMMAND_TMP} ${CMAKE_BINARY_DIR}/bin/${_TARGET}
+    add_test(${_TARGET} ${CMAKE_COMMAND} -E env "GNC_UNINSTALLED=YES;GNC_BUILDDIR=${CMAKE_BINARY_DIR};${ARGN}"
+      ${CMAKE_BINARY_DIR}/bin/${_TARGET}
     )
     set_tests_properties(${_TARGET} PROPERTIES ENVIRONMENT "GNC_UNINSTALLED=YES;GNC_BUILDDIR=${CMAKE_BINARY_DIR};${ARGN}")
   else()