exa2pro/starpu-max: porting work to Maxeler DFE @ 9613a3dd844081eca39a7a92a2a5b868fa2c7816

Cyril Roelandt 0514f248d3 starpu_init_noworker: unset environment variables so that they do not get in the way.		14 rokov pred
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invalid_blocking_calls.c	685f84fcdb Include valgrind.h in helper.h, not directly in the tests.	14 rokov pred
invalid_tasks.c	9aaa7caf99 tests: if starpu_init() returns -ENODEV, skip the test, do not fail it	14 rokov pred
starpu_init_noworker.c	0514f248d3 starpu_init_noworker: unset environment variables so that they do not get in the way.	14 rokov pred