spec/.../ole_method.rb: retry WIN32OLERuntimeError

This part sometimes causes random failure like:
https://ci.appveyor.com/project/ruby/ruby/builds/19382723/job/bedc33p4nolcqkp6

Let me retry this to make CI stable.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64993 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/library/win32ole/win32ole/shared/ole_method.rb

@@ -5,7 +5,20 @@ platform_is :windows do
 
   describe :win32ole_ole_method, shared: true do
     before :each do
-      @ie = WIN32OLESpecs.new_ole('InternetExplorer.Application')
+      # This part is unstable, so retrying 3 times.
+      tries = 0
+      begin
+        @ie = WIN32OLESpecs.new_ole('InternetExplorer.Application')
+      rescue WIN32OLERuntimeError => e
+        # WIN32OLERuntimeError: failed to create WIN32OLE object from `InternetExplorer.Application'
+        #     HRESULT error code:0x800704a6
+        #       A system shutdown has already been scheduled.
+        if tries < 3
+          tries += 1
+          $stderr.puts "win32ole_ole_method retry (#{tries}): #{e.class}: #{e.message}"
+          retry
+        end
+      end
     end
 
     after :each do