Use the new single-instance="true" attribute in vcl

Change-Id: I8ad9bf5631c2ae2e5a38eb8a422fa601d9f08c1b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/103842
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

vcl/vclplug_win.component

@@ -20,7 +20,7 @@
 <component loader="com.sun.star.loader.SharedLibrary" environment="@CPPU_ENV@"
     xmlns="http://openoffice.org/2010/uno-components">
   <implementation name="com.sun.star.datatransfer.DataFormatTranslator"
-        constructor="dtrans_CDataFormatTranslatorUNO_get_implementation">
+        constructor="dtrans_CDataFormatTranslatorUNO_get_implementation" single-instance="true">
     <service name="com.sun.star.datatransfer.DataFormatTranslator"/>
   </implementation>
   <implementation name="com.sun.star.comp.datatransfer.dnd.OleDragSource_V1"

vcl/win/dtrans/ftransl.cxx

@@ -26,7 +26,7 @@
 #include <com/sun/star/lang/IllegalArgumentException.hpp>
 #include <com/sun/star/uno/XComponentContext.hpp>
 #include <cppuhelper/supportsservice.hxx>
-#include <rtl/ref.hxx>
+#include <cppuhelper/weak.hxx>
 #include "ImplHelper.hxx"
 
 #include <shlobj.h>
@@ -540,8 +540,6 @@ extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
 dtrans_CDataFormatTranslatorUNO_get_implementation(
     css::uno::XComponentContext* context, css::uno::Sequence<css::uno::Any> const&)
 {
-    static rtl::Reference<CDataFormatTranslatorUNO> g_Instance(new CDataFormatTranslatorUNO(context));
-    g_Instance->acquire();
-    return static_cast<cppu::OWeakObject*>(g_Instance.get());
+    return cppu::acquire(static_cast<cppu::OWeakObject*>(new CDataFormatTranslatorUNO(context)));
 }
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