package/busybox: add dependency on attr

attr and busybox may each install setfattr, so attr must be installed
before busybox.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/busybox/busybox.mk

@@ -22,6 +22,7 @@ BUSYBOX_LDFLAGS = \
 
 # Packages that provide commands that may also be busybox applets:
 BUSYBOX_DEPENDENCIES = \
+	$(if $(BR2_PACKAGE_ATTR),attr) \
 	$(if $(BR2_PACKAGE_BASH),bash) \
 	$(if $(BR2_PACKAGE_BC),bc) \
 	$(if $(BR2_PACKAGE_BINUTILS),binutils) \