Moved unmatch arity check to depend file

To substitute suffixes and VPATH for nmake.

ext/-test-/cxxanyargs/depend

@@ -1,3 +1,11 @@
+$(DLLIB) $(STATIC_LIB): failure.failed
+
+failure.failed: failure.cpp cxxanyargs.o
+	$(Q)$(RUBY) -rfileutils \\
+	  -e "err = IO.popen(%[$(MAKE) failure.o], err:[:child, :out], &:read)" \\
+	  -e "abort err unless /rb_define_method/ =~ err" \\
+	  -e "FileUtils.touch(*ARGV)" $@
+
 # AUTOGENERATED DEPENDENCIES START
 cxxanyargs.o: $(RUBY_EXTCONF_H)
 cxxanyargs.o: $(arch_hdrdir)/ruby/config.h

ext/-test-/cxxanyargs/extconf.rb

@@ -24,16 +24,5 @@ end
 if ok
   $srcs = %w[cxxanyargs.cpp]
   $cleanfiles << "failure.failed"
-  create_makefile("-test-/cxxanyargs") do |mk|
-    mk << <<MK
-
-cxxanyargs.#$OBJEXT: failure.failed
-
-failure.failed: failure.cpp
-\t$(Q)$(RUBY) -rfileutils \\
-\t  -e "err = IO.popen(%[$(MAKE) failure.#$OBJEXT], err:[:child, :out], &:read)" \\
-\t  -e "abort err unless /rb_define_method/ =~ err" \\
-\t  -e "FileUtils.touch(*ARGV)" $@
-MK
-  end
+  create_makefile("-test-/cxxanyargs")
 end