directfb: use $(HOST_MAKE_ENV) when calling $(MAKE)

Signed-off-by: Gustavo Zacarias <gustavo.zacarias@free-electrons.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/directfb/directfb.mk

@@ -161,7 +161,7 @@ HOST_DIRECTFB_CONF_OPTS = \
 	--with-inputdrivers=none
 
 HOST_DIRECTFB_BUILD_CMDS = \
-	$(MAKE) -C $(@D)/tools directfb-csource
+	$(HOST_MAKE_ENV) $(MAKE) -C $(@D)/tools directfb-csource
 
 HOST_DIRECTFB_INSTALL_CMDS = \
 	$(INSTALL) -m 0755 $(@D)/tools/directfb-csource $(HOST_DIR)/usr/bin