[CMake][libclc] Improve dependencies to avoid build errors (#95018) With the Makefile generator and particularly high build parallelism some intermediate dependencies may be generated redundantly and concurrently, leading to build failures. To fix this, arrange for libclc's add_custom_commands to depend on targets in addition to files. This follows CMake documentation's[^1] guidance on add_custom_command: > Do not list the output in more than one independent target that may > build in parallel or the instances of the rule may conflict. Instead, > use the add_custom_target() command to drive the command and make the > other targets depend on that one. Eliminating the redundant commands also improves build times. [^1]: https://cmake.org/cmake/help/v3.29/command/add_custom_command.html
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