buildroot to build toolchain on Linux

Attached is a port of the Microtronix 2.6.11 Nios2 patch to kernel 2.6.15.6-uc0.

I believe the patch should be fairly complete, with module loading, ethernet (91c111), mtd, compact flash, usb, i2c e.t.c. NB: usb and i2c support is not tested on HW.

- Atle