Remove unused parboil makefiles

hpvm/test/parboil/common/Makefile.conf.example-ati

hpvm/test/parboil/common/Makefile.conf.example-mcuda

hpvm/test/parboil/common/Makefile.conf.example-nvidia

hpvm/test/parboil/common/mk/c.mk

hpvm/test/parboil/common/mk/cuda.mk

hpvm/test/parboil/common/mk/opencl.mk

hpvm/test/parboil/common/platform/c.default.mk

hpvm/test/parboil/common/platform/c.gcc.mk

hpvm/test/parboil/common/platform/cuda.arch20.mk

hpvm/test/parboil/common/platform/cuda.default.mk

hpvm/test/parboil/common/platform/cuda.mcuda.mk

hpvm/test/parboil/common/platform/cuda.nvcc.mk

hpvm/test/parboil/common/platform/opencl.default.mk

hpvm/test/parboil/common/platform/opencl.gcc.mk

hpvm/test/parboil/common/src/parboil_cuda.c

hpvm/test/parboil/common/src/parboil_opencl.c