[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			abs

VARIANT_HRH		/epoc32/include/test/abs.hrh

BUILD_INCLUDE	set		fakeA
BUILD_INCLUDE	append	fakeB

ROM_INCLUDE 	set		/epoc32/include/test/incA
ROM_INCLUDE 	append	/epoc32/include/test/incB