By MARIA FEONA IMPERIAL (Conclusion) THE decade 1975 to 1985 could be considered the golden years of the Metro Manila Film Festival, when it produced such classics as Ganito kami noon, paano kayo ngayon by Eddie Romero, Minsa’y isang gamu-gamu by Lupita Kashiwahara, Ina ka ng anak mo by Lino Brocka, Kisapmata by Mike de