Remove verbose from valgrind on CI

Makefile.custom

@@ -225,7 +225,7 @@ test: $(BUILD_IBIN)/test
 	./$<
 
 mem-check: $(BUILD_IBIN)/test
-	valgrind --verbose --track-origins=yes --error-exitcode=2 --leak-check=full ./$<
+	valgrind --track-origins=yes --error-exitcode=2 --leak-check=full ./$<
 
 test_ct: $(BUILD_IBIN)/test_ct
 	# NB: you must compile with XCFLAGS=-DNDEBUG or you will get lots of extra warnings due to assert(thing that is always true).