Dec 13 (Reuters) - GULF INVESTMENT HOUSE GIHK.KW : * OGM APPROVES CAPITAL DECREASE TO 6.1 MILLION DINARS FROM 16.4 MILLION DINARS TO DISTINGUISH ACCUMULATED LOSSES AS OF DEC 31, 2017 * OGM APPROVES CAPITAL INCREASE TO 40.6 MILLION DINARS FROM 6.1...