[libclc] Initial support for cross-compiling OpenCL libraries (#174022) Summary: The other GPU enabled libraries, (openmp, flang-rt, compiler-rt, libc, libcxx, libcxx-abi) all support builds through a runtime cross-build. In these builds we use a separate CMake build that cross-compiles to a single target. This patch provides basic support for this with the `libclc` libraries. Changes include adding support for the more standard GPU compute triples (amdgcn-amd-amdhsa, nvptx64-nvidia-cuda) and building only one target in this mode. Some things left to do: This patch does not change the compiler invocations, this method would allow us to use standard CMake routines but this keeps it minimal. The prebuild support is questionable and doesn't fit into this scheme because it's a host executable, I'm ignoring it for now. The installed location should just use the triple with no `libclc/` subdirectory handling I believe.
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