State immunity — Jurisdictional immunity — Construction contract — United States naval base in the Philippines — Tender by private company for repairs to shore installations — Claim against United States for breach of contract — Whether United States entitled to jurisdictional immunity — Restrictive doctrine of State immunity — Distinction between acts performed jure imperii and jure gestionis — Whether contract relating to exercise of sovereign functions — Whether conclusion of contract by United States Government constituting waiver of immunity — Philippines-United States Military Bases Agreement, 1947 — The law of the Philippines