Re: Some more <config.h> reminders

[Paul Eggert]

This patch doesn't look right, since it causes year2038 to depend on a 
bunch of modules like sys_shm that most programs don't need.

I don't know why year2038 should depend on sys_shm etc. But whatever the 
reason, let's remove those dependencies as they're more likely to cause 
problems than cure them. year2038 needs to depend on largefile, due to 
the way _TIME_BITS works. But it shouldn't need to depend on the other 
modules.

I suppose it would be OK for sys_shm etc. to depend on year2038, if 
there's some concern about one module being used without the other. 
Still, that seems like a bit of an imposition, as I assume some packages 
are not worried about the year2038 issue (they don't intend to be run on 
obsolescent 32-bit platforms) and so won't want to use year2038.