try hard to unset HOME and randfile

lib/hcrypto/test_crypto.in

@@ -83,9 +83,15 @@ done
 # RAND_file_name() when the enviroment is lacking those.
 #
 
+if [ -e /dev/random -o -e /dev/urandom -o -e /dev/srandom -o -e /dev/arandom ] ; then
+
+    # try hard to unset HOME and RANDFILE
     HOME=
     RANDFILE=
 
+    unset HOME
+    unset RANDFILE
+
     ${rand} --method=unix --file=unix 2>error
     res=$?
     if test "X$res" != X0 ; then
@@ -95,4 +101,6 @@ if test "X$res" != X0 ; then
         continue
     fi
 
+fi
+
 exit 0