sha1-586.pl: let masm compile AVX code.

crypto/sha/asm/sha1-586.pl

@@ -119,6 +119,10 @@ $ymm=1 if ($xmm && !$ymm && $ARGV[0] eq "win32n" &&
 		`nasm -v 2>&1` =~ /NASM version ([2-9]\.[0-9]+)/ &&
 		$1>=2.03);	# first version supporting AVX
 
+$ymm=1 if ($xmm && !$ymm && $ARGV[0] eq "win32" &&
+		`ml 2>&1` =~ /Version ([0-9]+)\./ &&
+		$1>=10);	# first version supporting AVX
+
 &external_label("OPENSSL_ia32cap_P") if ($xmm);