[CMake] Avoid build spam by switching to Debug message (#69497)

This is primarily only useful when debugging. It's generally assumed
that users
will have their custom flags applied if it's specified in their CMake
cache files.

Addresses
#68393 (comment)

Author: thevinster

llvm/cmake/modules/AddLLVM.cmake

@@ -1530,7 +1530,7 @@ endmacro(add_llvm_tool_subdirectory)
 
 macro(add_custom_linker_flags name)
   if (LLVM_${name}_LINKER_FLAGS)
-    message(STATUS "Applying ${LLVM_${name}_LINKER_FLAGS} to ${name}")
+    message(DEBUG "Applying ${LLVM_${name}_LINKER_FLAGS} to ${name}")
     target_link_options(${name} PRIVATE ${LLVM_${name}_LINKER_FLAGS})
   endif()
 endmacro()