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copy shadow map on rfork

--- a/sys.c

+++ b/sys.c

@@ -410,6 +410,10 @@

 			incref(t->dref);

 			t->data = t->dref + 1;

 			memcpy(t->data, s->data, s->size);

+			if(t->shadow != nil){

+				t->shadow = emalloc((s->size+7)/8);

+				memcpy(t->shadow, s->shadow, (s->size+7)/8);

+			}

 			p->S[i] = t;

 		} else {

 			incref(s->dref);