* ext/dl: revert dl with libffi because it can't run on mswin now.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@26764 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/dl/callback/extconf.rb

@@ -0,0 +1,14 @@
+require 'mkmf'
+
+if compiled?("dl")
+  callbacks = (0..8).map{|i| "callback-#{i}"}.unshift("callback")
+  callback_srcs = callbacks.map{|basename| "#{basename}.c"}
+  callback_objs = callbacks.map{|basename| "#{basename}.o"}
+
+  $distcleanfiles << '$(SRCS)'
+  $srcs = callback_srcs
+  $objs = callback_objs
+  $INCFLAGS << " -I$(srcdir)/.."
+
+  create_makefile("dl/callback")
+end