[libclc] Let builtins_remangle_path generating command depend on prepare-${obj_suffix} target #19619
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The add_custom_command depends on builtins_lib, but not on prepare-${obj_suffix} target that generates builtins_lib. cmake documentation doesn't mention that the add_custom_command will automatically depends on prepare-${obj_suffix} target.
The dependency was removed in f07c1fa. However, our downstream repo reintroduced it to fix build error in CMPLRLLVM-57824, where builtins_lib is used while still being generated.
This PR adds the dependency back. Then, cmake will create a target-level dependency to make sure prepare-${obj_suffix} target is built before target "remangled-${long_width}-${signedness}_char.${obj_suffix_mangled}".