selftests/landlock: Add binaries to .gitignore

Building the test creates binaries 'wait-pipe' and
'sandbox-and-launch' which need to be gitignore'd.

Signed-off-by: Bharadwaj Raju <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[mic: Sort entries]
Signed-off-by: Mickaël Salaün <[email protected]>

Author: bharadwaj-raju

tools/testing/selftests/landlock/.gitignore

@@ -1,2 +1,4 @@
 /*_test
+/sandbox-and-launch
 /true
+/wait-pipe