* test/dl/test_func.rb (test_name_with_block, test_bind, test_qsort1):
  call unbind to release the callback closure because maximum number
  of callbacks is limited to DL::MAX_CALLBACK (== 5) with pure DL
  without Fiddle.

* ext/dl/lib/dl/func.rb (DL::Function#unbind, #bound?): suppress
  NoMethodError when Fiddle is available. [ruby-core:50756] [Bug #7543]
* test/dl/test_func.rb (test_bound*, test_unbind*): tests for the above.

* ext/dl/lib/dl/func.rb (DL::Function#initialize, DL::Function#bind):
  ABI should be set by using CFunc#calltype even when Fiddle is used.
  When Fiddle is used and a block is given, name shoud not be ignored.
  [ruby-core:50562] [Bug #7514]

* ext/dl/lib/dl/import.rb (DL::Importer#bind_function): should respect
  abi and name when Fiddle is used.

* test/dl/test_func.rb (test_name_with_block): test for "name" method
  with giving a block.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@38506 b2dd03c8-39d4-4d8f-98ff-823fe69b080e