GLOBAL MARKETS-European shares head for first weekly drop since April

* European shares inch up, but Iraq concerns, data weigh * Most Asian markets in the red as U.S. growth outlook in spotlight * U.S. 10-year yield near 3-week low, German yield near 1-year trough * Canadian dollar at 6-month high following inflation surprise By Marc Jones LONDON, June 27 (Reuters) - Concerns about Iraq and Ukraine and subdued economic data left Eu