mpiCheckPhaseHook: use preset topoloy file in sandbox for mpich (#354136)

Author: markuskowa

pkgs/build-support/setup-hooks/mpi-check-hook/mpi-check-hook.sh

@@ -62,6 +62,8 @@ setupMpiCheck() {
     MPICH)
       # Fix to make mpich run in a sandbox
       export HYDRA_IFACE=lo
+      # Disable sysfs cpu topology directory discovery.
+      export HWLOC_XMLFILE="@topology@"
       ;;
     MVAPICH)
       # Disable CPU pinning