selftests: net: rds: add include.sh to EXTRA_CLEAN

The include.sh file is generated when building the net/rds selftests,
but there is no rule to delete it with the clean target. Add the file to
EXTRA_CLEAN in order to remove it when required.
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://patch.msgid.link/20241005-net-selftests-gitignore-v2-2-3a0b2876394a@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/rds/Makefile

@@ -8,6 +8,6 @@ TEST_PROGS := run.sh \
 
 TEST_FILES := include.sh
 
-EXTRA_CLEAN := /tmp/rds_logs
+EXTRA_CLEAN := /tmp/rds_logs include.sh
 
 include ../../lib.mk