sha512-x86_64.pl: fix linking problem under Windows.
(Imported from upstream's daa96141d31dbe6a6fadc6afc7cf9d1284d9bdd8)
Change-Id: Ibc55db0909585c6472b92af519ffbe717b79c90c
diff --git a/crypto/sha/asm/sha512-x86_64.pl b/crypto/sha/asm/sha512-x86_64.pl
index 23456f0..5a7c5ac 100644
--- a/crypto/sha/asm/sha512-x86_64.pl
+++ b/crypto/sha/asm/sha512-x86_64.pl
@@ -2263,7 +2263,7 @@
ret
.size se_handler,.-se_handler
___
-$code.=<<___ if ($shaext);
+$code.=<<___ if ($SZ == 4 && $shaext);
.type shaext_handler,\@abi-omnipotent
.align 16
shaext_handler:
