exa2pro/starpu-max: porting work to Maxeler DFE @ 964d7d47ef6e8195eef6e3bc7def6ebeaa885a9d

Nathalie Furmento 9aaa7caf99 tests: if starpu_init() returns -ENODEV, skip the test, do not fail it		14 lat temu
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variable_cuda.cu	d000709b48 Variable interface : standard test.	14 lat temu
variable_interface.c	9aaa7caf99 tests: if starpu_init() returns -ENODEV, skip the test, do not fail it	14 lat temu
variable_opencl.c	93b298df19 tests: test return value for starpu_opencl_load_opencl_from_file	14 lat temu
variable_opencl_kernel.cl	d000709b48 Variable interface : standard test.	14 lat temu