IRSL: Fix search for Windows redist files with Intel Classic compiler

Brad Kingrequested to merge
brad.king/cmake:irsl-intel-variants into master

The oneAPI icx/ifx compilers are under .../windows/bin. The classic icl/ifort compilers are under .../windows/bin/intel64. Add paths to the redist directory relative to both locations.

Fixes: #22673 (closed)

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