selftests/futex: Add futex_numa to .gitignore

futex_numa was never added to the .gitignore file.
Add it.

Fixes: 9140f57 ("futex,selftests: Add another FUTEX2_NUMA selftest")
Signed-off-by: Terry Tritton <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: André Almeida <[email protected]>
Link: https://lore.kernel.org/all/[email protected]

Author: Terry Tritton

tools/testing/selftests/futex/functional/.gitignore

@@ -11,3 +11,4 @@ futex_wait_timeout
 futex_wait_uninitialized_heap
 futex_wait_wouldblock
 futex_waitv
+futex_numa