http/Makefile: fix bug, only upphtml files being built because no

layouts exist for other formats

http/Makefile

@@ -31,7 +31,10 @@ blog_src = $(patsubst \
 	blogs/$(blog)/%.$(BLOG_EXT_$(blog)),\
 	src/$(blog)/%$(if $(BLOG_LAYOUT_$(blog)),.$(BLOG_LAYOUT_$(blog))).upphtml,\
 	$(shell find -L "blogs/$(blog)" -type f -and -name *.$(BLOG_EXT_$(blog))))
-layout_file = share/layouts/$(if $(layout),$(layout),default).layout.upp$(ext)
+default_layout_file = $(if \
+	$(shell [ -f "share/layouts/default.layout.$(ext)" ] && echo 1),\
+	share/layouts/default.layout.$(ext))
+layout_file = $(if $(layout),share/layouts/$(layout).layout.upp$(ext),$(default_layout_file))
 
 define out_rule =
 out/%.$(ext): src/%$(if $(layout),.$(layout)).upp$(ext) $(layout_file)