[libclc] Fix installation w/ ENABLE_RUNTIME_SUBNORMAL (#109926)

The `ARCHIVE` artifact kind is not valid for `install(FILES ...)`.

Additionally, install wasn't resolving the target's `TARGET_FILE`
properly and was trying to find it in the top-level build directory, rather than
in the libclc binary directory. This is because our `TARGET_FILE`
properties were being set to relative paths. The cmake behaviour they
are trying to mimic - `$<TARGET_FILE:$tgt>` - provides an absolute path.

As such this patch updates instances where we set the `TARGET_FILE`
property to return an absolute path.

GitOrigin-RevId: 9f3728d15721830ef1d29a8ae1af97124bc26b47
2 files changed