selftests: net: add msg_oob to gitignore

This executable is missing from the corresponding gitignore file.
Add msg_oob to the net gitignore list.

Signed-off-by: Javier Carrasco <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: javiercarrascocruz

tools/testing/selftests/net/.gitignore

@@ -16,6 +16,7 @@ ipsec
 ipv6_flowlabel
 ipv6_flowlabel_mgr
 log.txt
+msg_oob
 msg_zerocopy
 ncdevmem
 nettest