do not generate Init proto for sys and unsafe.

R=ken
OCL=24455
CL=24455

src/cmd/gc/dcl.c

@@ -1050,6 +1050,11 @@ fninit(Node *n)
 	uint32 h;
 	Sym *s;
 
+	if(strcmp(package, "PACKAGE") == 0) {
+		// sys.go or unsafe.go during compiler build
+		return;
+	}
+
 	r = N;
 
 	// (1)

src/cmd/gc/sysimport.c

@@ -59,12 +59,10 @@ char *sysimport =
 	"func sys.Goexit ()\n"
 	"func sys.Exit (? int)\n"
 	"func sys.Caller (n int) (pc uint64, file string, line int, ok bool)\n"
-	"func sys.Init·sys ()\n"
 	"\n"
 	"$$\n";
 char *unsafeimport =
 	"package unsafe\n"
 	"type unsafe.Pointer *any\n"
-	"func unsafe.Init·unsafe ()\n"
 	"\n"
 	"$$\n";