(Adds statement by UN secretary-general's spokesperson in paragraphs 4-5) * ICJ says Israel must support UN relief efforts in Gaza * Israel's ambassador calls ICJ decision 'shameful' * ICJ advisory opinion requested by UN General Assembly in December By Stephanie van den Berg THE HAGUE, Oct 22 (Reuters) – The United Nations' top legal body, the International Court of Justice, on Wednesday gave an advisory opinion saying that Israel is under the obligation to ensure the basic needs of the civilian population in Gaza are met. The panel of 11 judges added Israel has to support relief efforts provided by the United Nations in the Gaza Strip, and U.N. entities, including UNRWA, the United Nations Relief and Works Agency for Palestine Refugees in the Near East. "As an occupying power, Israel is

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