[SYCL][libdevice] Fix missing dependency on llvm-link (#17190)

`llvm-link` is used in `link_bc` when generating libdevice for Nvidia
and AMD, but was missing from the dependency list causing issues when
using custom tools.

Author: npmiller

libdevice/CMakeLists.txt

@@ -35,8 +35,9 @@ if(NOT EXISTS ${LIBCLC_CUSTOM_LLVM_TOOLS_BINARY_DIR})
   get_host_tool_path(llvm-foreach LLVM_FOREACH llvm-foreach_exe llvm-foreach_target)
   get_host_tool_path(llvm-spirv LLVM_SPIRV llvm-spirv_exe llvm-spirv_target)
   get_host_tool_path(sycl-post-link SYCL_POST_LINK sycl-post-link_exe sycl-post-link_target)
+  get_host_tool_path(llvm-link LLVM_LINK llvm-link_exe llvm-link_target)
 else()
-  foreach(tool IN ITEMS clang llvm-ar append-file clang-offload-bundler clang-offload-packager file-table-tform llvm-foreach llvm-spirv sycl-post-link)
+  foreach(tool IN ITEMS clang llvm-ar append-file clang-offload-bundler clang-offload-packager file-table-tform llvm-foreach llvm-spirv sycl-post-link llvm-link)
     find_program(LLVM_CUSTOM_TOOL_${tool} ${tool}
       PATHS ${LIBCLC_CUSTOM_LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
     set(${tool}_exe ${LLVM_CUSTOM_TOOL_${tool}})