HIP uses icd_dispatch.h, which is not a public header. Using the public
CL/cl_icd.h removes inclusion of the private header.
This allows compiling HIP without relying on OCL ICD source, which makes
distributing a standalone ROCclr easier.
For WIN32, a few other headers are required.
Signed-off-by: Jeremy Newton <Jeremy.Newton@amd.com>
Change-Id: I0cab173b9753c5b0ab3be9222aa8bb0545cdeaab