2.5.47: Link-time error: llc_sap_open when using modules

[Eric Buddington]

This is a long-standing error, I think even discussed before. It goes
away if I set the LLC options to 'Y' instead of 'M'.

With most things configured as modules, make bzImage says:

net/built-in.o: In function `p8022_request':
net/built-in.o(.text+0x12ea6): undefined reference to `llc_build_and_send_ui_pkt'
net/built-in.o: In function `register_8022_client':
net/built-in.o(.text+0x12efd): undefined reference to `llc_sap_open'
net/built-in.o: In function `unregister_8022_client':
net/built-in.o(.text+0x12f42): undefined reference to `llc_sap_close'
net/built-in.o: In function `snap_request':
net/built-in.o(.text+0x130d2): undefined reference to `llc_build_and_send_ui_pkt'
net/built-in.o: In function `snap_init':
net/built-in.o(.init.text+0x6d3): undefined reference to `llc_sap_open'
make: *** [.tmp_vmlinux1] Error 1

-Eric