Use busybox mount instead of klibc nfsmount for nfs mounts in initrd.

modules/system/boot/stage-1-init.sh

@@ -266,11 +266,7 @@ mountFS() {
     # For CIFS mounts, retry a few times before giving up.
     local n=0
     while true; do
-        if [ "$fsType" = "nfs" ]; then
-          nfsmount "$device" "/mnt-root$mountPoint" && break
-        else
-          mount "/mnt-root$mountPoint" && break
-        fi
+        mount "/mnt-root$mountPoint" && break
         if [ "$fsType" != cifs -o "$n" -ge 10 ]; then fail; break; fi
         echo "retrying..."
         n=$((n + 1))

modules/tasks/filesystems/nfs.nix

@@ -40,12 +40,6 @@ in
 
     boot.initrd.kernelModules = mkIf inInitrd [ "nfs" ];
 
-    boot.initrd.extraUtilsCommands = mkIf inInitrd
-      ''
-        # !!! Uh, why don't we just install mount.nfs?
-        cp -v ${pkgs.klibc}/lib/klibc/bin.static/nfsmount $out/bin
-      '';
-
     # Ensure that statd and idmapd are started before mountall.
     jobs.mountall.preStart =
       ''