update sysimport.c for unsafe.Offset and Sizeof

R=ken
DELTA=2  (2 added, 0 deleted, 0 changed)
OCL=24643
CL=24643

src/cmd/gc/sysimport.c

@@ -65,5 +65,7 @@ char *sysimport =
 char *unsafeimport =
 	"package unsafe\n"
 	"type unsafe.Pointer *any\n"
+	"func unsafe.Offsetof (? any) (? int)\n"
+	"func unsafe.Sizeof (? any) (? int)\n"
 	"\n"
 	"$$\n";