[ruby/win32ole] Use omit instead of skip for test-unit

https://github.com/ruby/win32ole/commit/c0586b2f75

test/win32ole/test_err_in_callback.rb

@@ -38,7 +38,7 @@ if defined?(WIN32OLE)
     end
 
     def test_err_in_callback
-      skip "'ADODB.Connection' is not available" unless available_adodb?
+      omit "'ADODB.Connection' is not available" unless available_adodb?
       if @ruby
         Dir.mktmpdir do |tmpdir|
           logfile = File.join(tmpdir, "test_err_in_callback.log")

test/win32ole/test_win32ole_event.rb

@@ -136,7 +136,7 @@ if defined?(WIN32OLE_EVENT)
         @wmi.ExecNotificationQueryAsync(@sws, @sql)
       rescue => e
         if /OLE error code:80041008 in SWbemServicesEx/ =~ e.message
-          skip "No administrator privilege?"
+          omit "No administrator privilege?"
         end
         raise
       end

test/win32ole/test_win32ole_method_event.rb

@@ -10,7 +10,7 @@ if defined?(WIN32OLE_METHOD)
   class TestWIN32OLE_METHOD_EVENT < Test::Unit::TestCase
     unless AvailableOLE.sysmon_available?
       def test_dummy_for_skip_message
-        skip 'System Monitor Control is not available'
+        omit 'System Monitor Control is not available'
       end
     else
       def setup

test/win32ole/test_win32ole_param_event.rb

@@ -23,7 +23,7 @@ if defined?(WIN32OLE_PARAM)
       end
     else
       def test_dummy_for_skip_message
-        skip 'ActiveX Data Object Library and MS XML not found'
+        omit 'ActiveX Data Object Library and MS XML not found'
       end
     end
   end

test/win32ole/test_win32ole_record.rb

@@ -76,7 +76,7 @@ if defined?(WIN32OLE_RECORD)
   class TestWIN32OLE_RECORD_BY_RBCOMTEST < Test::Unit::TestCase
     unless rbcomtest_exist?
       def test_dummy_for_skip_message
-        skip "#{PROGID_RBCOMTEST} for WIN32OLE_RECORD test is not installed"
+        omit "#{PROGID_RBCOMTEST} for WIN32OLE_RECORD test is not installed"
       end
     else
       def setup

test/win32ole/test_win32ole_type_event.rb

@@ -12,7 +12,7 @@ if defined?(WIN32OLE_TYPE)
   class TestWIN32OLE_TYPE_EVENT < Test::Unit::TestCase
     unless AvailableOLE.sysmon_available?
       def test_dummy_for_skip_message
-        skip 'System Monitor Control is not available'
+        omit 'System Monitor Control is not available'
       end
     else
 

test/win32ole/test_word.rb

@@ -35,7 +35,7 @@ if defined?(WIN32OLE)
   class TestWIN32OLE_WITH_WORD < Test::Unit::TestCase
     unless word_installed?
       def test_dummy_for_skip_message
-        skip "Microsoft Word is not installed"
+        omit "Microsoft Word is not installed"
       end
     else
       def setup