Detect whether the underlying FS supports xattrs

No support for xattrs is treated the same as a file having no xattrs on a
file system which does support xattrs. This should fix Debian BR #470184

metaentry.c

@@ -220,6 +220,10 @@ mentry_create(const char *path)
 
 	lsize = listxattr(path, NULL, 0);
 	if (lsize < 0) {
+		/* Perhaps the FS doesn't support xattrs? */
+		if (errno == ENOTSUP)
+			return mentry;
+
 		msg(MSG_ERROR, "listxattr failed for %s: %s\n",
 		    path, strerror(errno));
 		return NULL;

metaentry.h

@@ -18,7 +18,7 @@
  *
  */
 
-/* Data structure to hold all metadata for a file */
+/* Data structure to hold all metadata for a file/dir */
 struct metaentry {
 	struct metaentry *next;
 	char *path;