allow enabling BROKEN images

People asked for the Raspberry Pi 4, but it's currently broken and hence
is not build if one doesn't set BROKEN. Thus, allow us to set BROKEN for
some targets to allow these images to be built.

.gitlab-ci.yml

@@ -47,7 +47,7 @@ update:
     - rm -rf gluon/openwrt/dl && mkdir -p gluon/openwrt && ln -s ../../ffs-openwrt-dl-cache gluon/openwrt/dl
     - rm -rf gluon/openwrt/staging_dir && mkdir -p staging_dir && ln -s ../../staging_dir gluon/openwrt/staging_dir
   script:
-    - make -C gluon GLUON_SITEDIR="$CI_PROJECT_DIR" GLUON_TARGET="$GLUON_TARGET" GLUON_BRANCH=stable FFS_BUILD_DATE=$(cat build.date) V=1 -j`nproc`
+    - make -C gluon GLUON_SITEDIR="$CI_PROJECT_DIR" GLUON_TARGET="$GLUON_TARGET" GLUON_BRANCH=stable FFS_BUILD_DATE=$(cat build.date) BROKEN="$BROKEN" V=1 -j`nproc`
     - cd gluon/openwrt/dl && git add . && git commit -m "update DL cache" && git push || true
   except:
     - tags

buildall.sh

@@ -33,5 +33,5 @@ make -C gluon update GLUON_SITEDIR="$sitedir" V=1
 
 for target in ${TARGETS[@]}; do
 	echo Building $target
-	make -C gluon GLUON_TARGET=$target GLUON_BRANCH=$branch GLUON_SITEDIR="$sitedir" V=1 -j`nproc`
+	make -C gluon GLUON_TARGET=$target GLUON_BRANCH=$branch GLUON_SITEDIR="$sitedir" BROKEN=1 V=1 -j`nproc`
 done