[PATCH] x86 (__HAVE_FLOAT128): Defined to 0 for Intel SYCL compiler [BZ #32723]

[H.J. Lu]

Intel compiler always defines __INTEL_LLVM_COMPILER.  When SYCL is
enabled by -fsycl, it also defines SYCL_LANGUAGE_VERSION.  Since Intel
SYCL compiler doesn't support _Float128:

https://github.com/intel/llvm/issues/16903

define __HAVE_FLOAT128 to 0 for Intel SYCL compiler.

This fixes BZ #32723.

-- 
H.J.
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