Supress another error when compiling for ARM.

Conflicts:
	src/platform/lpc17xx/lpc17xx.mk
Move to a simple list of accep. filters - handle tables in platforms.
Standardize add/remove filter functions, re-configure on all platforms.
Use different buffers for each CAN controller on PIC32.

I'm not sure if this was causing problems, but it was definitely wrong -
each controller is supposed to have its own buffer.
Merge branch 'next' into filter-refactor

Conflicts:
	src/platform/pic32/canutil.cpp
Add buses array to filter initialization functions.
Load AF entires one by one, since it's easier than sorting the table.
Minimize the number of places where AF mode changes.
Manually zero out the CAN AF register, the NXP library is buggy.

The previously method left the AF table corrupted and no filters would
work.