Makefile: add /etc/bash_completion.d to non-bash purge

Currently, we delete /usr/share/bash-completion when bash is not enabled.
We need to delete /etc/bash_completion.d too. For example, the jo package
installs files there:

/etc/bash_completion.d/jo.bash

Signed-off-by: Danomi Manchego <danomimanchego123@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 18072ecc24b8f288cf131e0d3dcceb0bb6c955c8)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

Makefile

@@ -757,6 +757,7 @@ ifneq ($(BR2_PACKAGE_GDB),y)
 endif
 ifneq ($(BR2_PACKAGE_BASH),y)
 	rm -rf $(TARGET_DIR)/usr/share/bash-completion
+	rm -rf $(TARGET_DIR)/etc/bash_completion.d
 endif
 ifneq ($(BR2_PACKAGE_ZSH),y)
 	rm -rf $(TARGET_DIR)/usr/share/zsh