$NetBSD$

The tests build a binary test runner which is executed during the build.
This doesn't work with pkgsrc cross builds. Disable it for now.

--- Makefile.orig	2024-05-25 07:40:58.715033583 +0000
+++ Makefile
@@ -2,13 +2,11 @@
 all:
 	@$(MAKE) -C sml
 	@$(MAKE) -C examples
-	@$(MAKE) -C test
 
 .PHONY: clean install uninstall
 clean:
 	@$(MAKE) -C sml clean
 	@$(MAKE) -C examples clean
-	@$(MAKE) -C test clean
 
 install: all
 	@$(MAKE) -C sml install