tell cabal to shut up

Makefile

@@ -58,7 +58,7 @@ $(BUILDDIR)/index.html: $(DATADIR)/galleries.yaml $(MAKEPAGES)
 $(MAKEPAGES): make-pages/*.hs make-pages/make-pages.cabal
 	echo "[make-pages]"
 	mkdir -p $(dir $@)
-	cabal v2-build all -O0 -j
+	cabal v2-build all -O0 -v0 -j
 	find dist-newstyle -name make-pages -executable -type f \
 	  -exec cp {} $@ \;