ASMARA, Eritrea — A 42-year-old man in solitary confinement is the latest of three Christians to die in the last four months in Eritrean military prisons. They were all incarcerated for their faith. Open Doors, a Christian support group, learned that Mehari Gebreneguse Asgedom, the latest to die at the Mitire Military Confinement center, was tortured and suffered from diabetes…