sd: fix comphelper::OInterfaceCompare build breakage

This was removed today.

Change-Id: I07e7515d0d4b63721c6f80193917a9e1c5f1f09b
diff --git a/sd/source/filter/eppt/pptx-animations.cxx b/sd/source/filter/eppt/pptx-animations.cxx
index da5223c..c1c86f4 100644
--- a/sd/source/filter/eppt/pptx-animations.cxx
+++ b/sd/source/filter/eppt/pptx-animations.cxx
@@ -635,8 +635,7 @@ class PPTXAnimationExport
    const FSHelperPtr& mpFS;
    const NodeContext* mpContext;

    std::map<Reference<XAnimationNode>, sal_Int32, ::comphelper::OInterfaceCompare<XAnimationNode>>
        maAnimationNodeIdMap;
    std::map<Reference<XAnimationNode>, sal_Int32> maAnimationNodeIdMap;
    sal_Int32 GetNextAnimationNodeId(const Reference<XAnimationNode>& rNode);
    sal_Int32 GetAnimationNodeId(const Reference<XAnimationNode>& rNode);