.gitattributes: Treat file containing test SDDL as binary

This file contains some very long lines that can make it hard to grep
for things from the terminal.

Signed-off-by: Joseph Sutton <[email protected]>
Reviewed-by: Andrew Bartlett <[email protected]>

Author: jsutton24

.gitattributes

@@ -1,6 +1,7 @@
 *.dump binary
 *.SAMBABACKUP binary
 libcli/security/tests/data/conditional_aces.txt.json binary
+libcli/security/tests/windows/non_canonical.txt binary
 testdata/compression/compressed-huffman/** binary
 testdata/compression/compressed-more-huffman/** binary
 testdata/compression/compressed-more-plain/** binary