patch 9.0.2034: don't try to copy SMACK attribute, when none exist

Problem:  don't try to copy SMACK attribute, when none exist
Solution: return early if SMACK extended attributes do not exist or
          if they are not supported

closes: #1711
closes: #13348

Signed-off-by: Christian Brabandt <cb@256bit.org>

src/os_unix.c

@@ -3047,6 +3047,11 @@ mch_copy_sec(char_u *from_file, char_u *to_file)
     if (from_file == NULL)
 	return;
 
+    size = listxattr((char *)from_file, NULL, 0);
+    // not supported or no attributes to copy
+    if (errno == ENOTSUP || size == 0)
+	return;
+
     for (index = 0 ; index < (int)(sizeof(smack_copied_attributes)
 			      / sizeof(smack_copied_attributes)[0]) ; index++)
     {

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2034,
 /**/
     2033,
 /**/