Lack of Input-Core causes link errors

[Dave Hansen <haveblue@us.ibm.com>]

Current bk tree won't compile without initcore compiled in.  Adding it 
makes the link errors go away.  I saw a comment in Linus's changelog about 
this, is there a fix in progress?

drivers/built-in.o: In function `kd_nosound':
drivers/built-in.o(.text+0x1603f): undefined reference to `input_event'
drivers/built-in.o(.text+0x16058): undefined reference to `input_event'
drivers/built-in.o: In function `kd_mksound':
drivers/built-in.o(.text+0x160e7): undefined reference to `input_event'
drivers/built-in.o: In function `kbd_bh':
drivers/built-in.o(.text+0x16cca): undefined reference to `input_event'
drivers/built-in.o(.text+0x16cd8): undefined reference to `input_event'
drivers/built-in.o(.text+0x16ce9): more undefined references to 
`input_event' follow
drivers/built-in.o: In function `kbd_connect':
drivers/built-in.o(.text+0x170e3): undefined reference to `input_open_device'
drivers/built-in.o: In function `kbd_disconnect':
drivers/built-in.o(.text+0x170ff): undefined reference to `input_close_device'
drivers/built-in.o: In function `kbd_init':
drivers/built-in.o(.text.init+0x1c57): undefined reference to 
`input_register_handler'

-- 
Dave Hansen
haveblue@us.ibm.com