include: add a no dict version of lzma to new image build code

Required to compress kernels in a brnboot compatible way.

Signed-off-by: Mathias Kresin <openwrt@kresin.me>

SVN-Revision: 49240

include/image.mk

@@ -336,7 +336,11 @@ define Build/fit
 endef
 
 define Build/lzma
-	$(STAGING_DIR_HOST)/bin/lzma e $@ -lc1 -lp2 -pb2 $(1) $@.new
+	$(call Build/lzma-no-dict,-lc1 -lp2 -pb2 $(1))
+endef
+
+define Build/lzma-no-dict
+	$(STAGING_DIR_HOST)/bin/lzma e $@ $(1) $@.new
 	@mv $@.new $@
 endef