cmd/gc, cmd/ld: fix warnings on Plan 9

src/cmd/gc/closure.c:133 param declared and not used: nowrap
src/cmd/gc/const.c:1139 set and not used: t1
src/cmd/ld/data.c:652 format mismatch #llx INT, arg 7
src/cmd/ld/data.c:652 format mismatch #llx INT, arg 8
src/cmd/ld/data.c:1230 set and not used: datsize

R=dave, golang-dev, lucio.dere, remyoudompheng, bradfitz
CC=golang-dev
https://golang.org/cl/8182043

src/cmd/gc/closure.c

@@ -76,7 +76,7 @@ closurebody(NodeList *body)
 	return func;
 }
 
-static Node* makeclosure(Node *func, int nowrap);
+static Node* makeclosure(Node *func);
 
 void
 typecheckclosure(Node *func, int top)
@@ -125,11 +125,11 @@ typecheckclosure(Node *func, int top)
 	}
 
 	// Create top-level function 
-	xtop = list(xtop, makeclosure(func, func->cvars==nil || (top&Ecall)));
+	xtop = list(xtop, makeclosure(func));
 }
 
 static Node*
-makeclosure(Node *func, int nowrap)
+makeclosure(Node *func)
 {
 	Node *xtype, *v, *addr, *xfunc, *cv;
 	NodeList *l, *body;

src/cmd/gc/const.c

@@ -1136,7 +1136,6 @@ defaultlit(Node **np, Type *t)
 
 	lno = setlineno(n);
 	ctype = idealkind(n);
-	t1 = T;
 	switch(ctype) {
 	default:
 		if(t != T) {

src/cmd/ld/data.c

@@ -650,7 +650,7 @@ datblk(int32 addr, int32 size)
 					break;
 				}
 				Bprint(&bso, "\treloc %.8ux/%d %s %s+%#llx [%#llx]\n",
-					(uint)(sym->value+r->off), r->siz, typ, rsname, r->add, r->sym->value+r->add);
+					(uint)(sym->value+r->off), r->siz, typ, rsname, (vlong)r->add, (vlong)(r->sym->value+r->add));
 			}
 		}				
 	}
@@ -1227,7 +1227,6 @@ dodata(void)
 
 	/* we finished segdata, begin segtext */
 	s = datap;
-	datsize = 0;
 
 	/* read-only data */
 	sect = addsection(&segtext, ".rodata", 04);