exa2pro/starpu-max: porting work to Maxeler DFE @ 5a9ca105f6ee4aac4fb941f1f26c3e16d6afe1a7

Nathalie Furmento 8381f79759 minor fixes to handle compiler warnings		13 lat temu
..
invalid_blocking_calls.c	685f84fcdb Include valgrind.h in helper.h, not directly in the tests.	13 lat temu
invalid_tasks.c	8381f79759 minor fixes to handle compiler warnings	13 lat temu
starpu_init_noworker.c	8381f79759 minor fixes to handle compiler warnings	13 lat temu