don't include USB on wr710

some versions only have 4MB

site.mk

@@ -77,7 +77,7 @@ ifeq ($(GLUON_TARGET),x86-generic)
 endif
 
 ifeq ($(GLUON_TARGET),ar71xx-generic)
-	GLUON_TLWR710_SITE_PACKAGES := $(USB_PACKAGES_BASIC)
+	# GLUON_TLWR710_SITE_PACKAGES := $(USB_PACKAGES_BASIC) # there are also versions with just 4MB
 	GLUON_TLWR1043_SITE_PACKAGES := $(USB_PACKAGES)
 	GLUON_TLWR842_SITE_PACKAGES := $(USB_PACKAGES)
 	GLUON_TLWDR4300_SITE_PACKAGES := $(USB_PACKAGES)