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snprint_real: don't use strcpy to shut openbsd up

--- a/print.c

+++ b/print.c

@@ -614,8 +614,10 @@

 			// don't need trailing .

 			if(s[sz-1] == '.')

 				s[--sz] = '\0';

-			if(num_format[1] == 'e')

-				strcpy(s+sz, e);

+			if(num_format[1] == 'e'){

+				while(*e)

+					s[sz++] = *e++;

+			}

 		}

 	}

 }