Dinkins Is Customizing His Stock Message
LEAD: As David N. Dinkins left a mayoral forum at Co-op City in the Bronx Monday night to generally cordial applause, an elderly white woman stopped him to pay what, for her if not the gray-haired but vigorous candidate, might have been the ultimate compliment. ''You look great for 62,'' she shouted. But of the several dozen supporters who enthusiastically followed Mr.
