Implement a pyton script to auto generate those builtin vector functions.

Implement a pyton script to auto generate those builtin vector functions.

As Beignet is using the SOA model, and we need to lower down all
the vector builtin functions to the scalar version. This type of
thing is ideal to use a script to generate all the code according
to the OpenCL's spec. I just copy/paste most of the prototypes from
the OpenCL spec and put them into builtin_vector_proto.def. Then
I wrote a python script to parse the spec and generate all the
vector inline functions and I removed all existing duplicate
functions in ocl_stdlib.h.

Signed-off-by: Zhigang Gong <zhigang.gong@linux.intel.com>
Reviewed-by: He Junyan <junyan.he@inbox.com>
Reviewed-by: Simon Richter <Simon.Richter@hogyros.de>