x86_64 assembly pack: make Windows build more robust [from master].

PR: 2963 and a number of others

crypto/modes/asm/ghash-x86_64.pl

@@ -50,7 +50,8 @@ $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
 ( $xlate="${dir}../../perlasm/x86_64-xlate.pl" and -f $xlate) or
 die "can't locate x86_64-xlate.pl";
 
-open STDOUT,"| \"$^X\" $xlate $flavour $output";
+open OUT,"| \"$^X\" $xlate $flavour $output";
+*STDOUT=*OUT;
 
 # common register layout
 $nlo="%rax";