Disable images and targets which aren't known to work by default

They can still be enabled by supplying BROKEN=1.

targets/ar71xx-generic/profiles.mk

@@ -25,7 +25,10 @@ $(eval $(call GluonModel,TLWR841,tl-wr841n-v9-squashfs,tp-link-tl-wr841n-nd-v9))
 # TL-WR842N/ND v1, v2
 $(eval $(call GluonProfile,TLWR842))
 $(eval $(call GluonModel,TLWR842,tl-wr842n-v1-squashfs,tp-link-tl-wr842n-nd-v1))
+
+ifeq ($(BROKEN),1)
 $(eval $(call GluonModel,TLWR842,tl-wr842n-v2-squashfs,tp-link-tl-wr842n-nd-v2))
+endif
 
 # TL-WR941N/ND v2, v3, v4
 $(eval $(call GluonProfile,TLWR941))
@@ -62,7 +65,11 @@ $(eval $(call GluonModel,TLMR3220,tl-mr3220-v1-squashfs,tp-link-tl-mr3220-v1))
 # TL-MR3420 v1, v2
 $(eval $(call GluonProfile,TLMR3420))
 $(eval $(call GluonModel,TLMR3420,tl-mr3420-v1-squashfs,tp-link-tl-mr3420-v1))
+
+ifeq ($(BROKEN),1)
 $(eval $(call GluonModel,TLMR3420,tl-mr3420-v2-squashfs,tp-link-tl-mr3420-v2))
+endif
+
 
 ## Ubiquiti (everything)
 $(eval $(call GluonProfile,UBNT))
@@ -71,6 +78,9 @@ $(eval $(call GluonModel,UBNT,ubnt-nano-m-squashfs,ubiquiti-nanostation-m))
 $(eval $(call GluonModel,UBNT,ubnt-unifi-squashfs,ubiquiti-unifi))
 $(eval $(call GluonModel,UBNT,ubnt-unifi-outdoor-squashfs,ubiquiti-unifiap-outdoor))
 
+
+## D-Link
+
 # D-Link DIR-615 rev. E1
 $(eval $(call GluonProfile,DIR615E1))
 $(eval $(call GluonModel,DIR615E1,dir-615-e1-squashfs,d-link-dir-615-rev-e1))

targets/targets.mk

 $(eval $(call GluonTarget,ar71xx,generic))
+
+ifeq ($(BROKEN),1)
 $(eval $(call GluonTarget,x86,generic))
+endif