fix the gcc warning about the initialisation order of variables caused

by moving Policy to public again (and therefore after SrcList)

apt-pkg/cachefile.cc

@@ -28,7 +28,7 @@
 // ---------------------------------------------------------------------
 /* */
 pkgCacheFile::pkgCacheFile() : Map(NULL), Cache(NULL), DCache(NULL),
-				Policy(NULL), SrcList(NULL)
+				SrcList(NULL), Policy(NULL)
 {
 }
 									/*}}}*/