[GCCE] We need a way for the HAL config extension to parameterise the HAL config file (.hcf) that will be used, depending upon the toolchain we are building with. E.g. if we are building BeagleBoard with RVCT we can configure hardware floating point because we have ARM's vfp math libraries; if we are building it with GCC, we lack this library support.

VARIANT variant_b
EXTENDS default

BUILD_INCLUDE	append	/epoc32/include/variant/b