gitignore: add WAF lockfile

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15497

Signed-off-by: Michael Adam <[email protected]>
Reviewed-by: Christof Schmitt <[email protected]>
Reviewed-by: Andrew Bartlett <[email protected]>

Autobuild-User(master): Andrew Bartlett <[email protected]>
Autobuild-Date(master): Tue Oct 17 04:16:29 UTC 2023 on atb-devel-224

Author: obnoxxx

.gitignore

@@ -88,3 +88,4 @@ compile_commands.json
 .clangd/
 .cache/
 .ropeproject/
+.tmplock