Configure: make it work with Perl 5.10.

Reviewed-by: Richard Levitte <levitte@openssl.org>

Configure

diff --git a/Configure b/Configure
index 52d4f93..43a326a 100755
--- a/Configure
+++ b/Configure
@@ -1036,7 +1036,7 @@
 }
 
 unless ($disabled{fuzz}) {
-    push $config{dirs}, "fuzz";
+    push @{$config{dirs}}, "fuzz";
     $config{cflags} .= "-fsanitize-coverage=edge,indirect-calls ";
 }