Fix test to follow the behavior of NetBSD's dlsym.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27891 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/dl/test_handle.rb

@@ -23,8 +23,16 @@ module DL
 
     def test_static_sym
       skip "DL::Handle.sym is not supported" if /mswin|mingw/ =~ RUBY_PLATFORM
-      assert_not_nil DL::Handle.sym('dlopen')
-      assert_equal DL::Handle.sym('dlopen'), DL::Handle['dlopen']
+      begin
+        # Linux / Darwin / FreeBSD
+       assert_not_nil DL::Handle.sym('dlopen')
+       assert_equal DL::Handle.sym('dlopen'), DL::Handle['dlopen']
+      rescue
+        # NetBSD
+        require 'objspace'
+       assert_not_nil DL::Handle.sym('Init_objspace')
+       assert_equal DL::Handle.sym('Init_objspace'), DL::Handle['Init_objspace']
+      end
     end
 
     def test_sym_closed_handle