sha[1|512]-x86_64.pl: fix logical errors with $shaext=0.

crypto/sha/asm/sha1-x86_64.pl

@@ -1835,7 +1835,9 @@ se_handler:
 
 	jmp	.Lcommon_seh_tail
 .size	se_handler,.-se_handler
+___
 
+$code.=<<___ if ($shaext);
 .type	shaext_handler,\@abi-omnipotent
 .align	16
 shaext_handler:
@@ -1868,7 +1870,9 @@ shaext_handler:
 
 	jmp	.Lcommon_seh_tail
 .size	shaext_handler,.-shaext_handler
+___
 
+$code.=<<___;
 .type	ssse3_handler,\@abi-omnipotent
 .align	16
 ssse3_handler:
@@ -1991,9 +1995,13 @@ $code.=<<___;
 .LSEH_info_sha1_block_data_order:
 	.byte	9,0,0,0
 	.rva	se_handler
+___
+$code.=<<___ if ($shaext);
 .LSEH_info_sha1_block_data_order_shaext:
 	.byte	9,0,0,0
 	.rva	shaext_handler
+___
+$code.=<<___;
 .LSEH_info_sha1_block_data_order_ssse3:
 	.byte	9,0,0,0
 	.rva	ssse3_handler

crypto/sha/asm/sha512-x86_64.pl

@@ -2339,10 +2339,12 @@ $code.=<<___;
 	.rva	se_handler
 	.rva	.Lprologue,.Lepilogue			# HandlerData[]
 ___
-$code.=<<___ if ($SZ==4);
+$code.=<<___ if ($SZ==4 && $shaext);
 .LSEH_info_${func}_shaext:
 	.byte	9,0,0,0
 	.rva	shaext_handler
+___
+$code.=<<___ if ($SZ==4);
 .LSEH_info_${func}_ssse3:
 	.byte	9,0,0,0
 	.rva	se_handler