[Beignet] Fix definition of FLT_MIN/FLT_MAX for clang-3.8 compilation

[Andrew Lavin]

Using clang-3.8, I need the attached patch in order to compile beignet.
Otherwise I get lots of errors that look like:

/home/andrew/Downloads/beignet-intel_subgroups/utests/builtin_exp.cpp:18:48:
error:
      non-constant-expression cannot be narrowed from type 'double' to
'float' in initializer list
      [-Wc++11-narrowing]
const float input_data[] = {FLT_MAX, -FLT_MAX, FLT_MIN, -FLT_MIN, 80, -80,
3.14, -3.14, -0.5, 0.5, ...

- Andrew
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