Support for cbfs. Also factor out the part which is common

for all archives to a separate module. This splits tar from cpio
	as they are very different but keeps cpio, cpio_be, odc and newc
	together since they're very similar.

grub-core/Makefile.core.def

@@ -1145,6 +1145,16 @@ module = {
   cppflags = '-I$(srcdir)/lib/posix_wrap -I$(srcdir)/lib/minilzo -DMINILZO_HAVE_CONFIG_H';
 };
 
+module = {
+  name = archelp;
+  common = fs/archelp.c;
+};
+
+module = {
+  name = cbfs;
+  common = fs/cbfs.c;
+};
+
 module = {
   name = cpio;
   common = fs/cpio.c;