[libclc] Fix building top-level 'libclc' target (#150972)HEADmain

With libclc being a 'runtime', the top-level build assumes that there is
a corresopnding 'libclc' target. We previously weren't providing this,
leading to a build failure if the user tried to build it.

This commit remedies this by adding support for building the 'libclc'
target. It does so by adding dependencies from the OpenCL builtins to
this target. It uses a configurable in-between target -
libclc-opencl-builtins - to ease the possibility of adding non-OpenCL
builtin libraries in the future.

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