fix the bug of WIN32OLE_VARIANT.new when variant type is
VT_ARRAY.
* ext/win32ole/sample/excel1.rb: rewrite using WIN32OLE_VARIANT.
* test/win32ole/test_win32ole.rb: add some test.
* test/win32ole/test_win32ole_variant.rb: ditto.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@11624 b2dd03c8-39d4-4d8f-98ff-823fe69b080e