Windows build system: get uplink right.

Reviewed-by: Richard Levitte <levitte@openssl.org>
diff --git a/ms/uplink-x86_64.pl b/ms/uplink-x86_64.pl
index 48bf559..0cb0f1b 100755
--- a/ms/uplink-x86_64.pl
+++ b/ms/uplink-x86_64.pl
@@ -1,6 +1,6 @@
 #!/usr/bin/env perl
 
-$output=shift;
+$output=pop;
 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
 open OUT,"| \"$^X\" ${dir}../crypto/perlasm/x86_64-xlate.pl $output";
 *STDOUT=*OUT;