What was Goal that where Competition of international friendly, and a Result of 2–1?
CREATE TABLE "mohamed_al_zeno_international_goals" (
  "goal" real,
  "date" text,
  "venue" text,
  "score" text,
  "result" text,
  "competition" text
);
SELECT "goal" FROM "mohamed_al_zeno_international_goals" WHERE "competition"='international friendly' AND "result"='2–1';