Fix MacUpdater build on CMake 3.31+

Building on macOS with a recent CMake version would result in the
following error:

CMake Error at Source/Core/MacUpdater/CMakeLists.txt:48 (add_custom_command):
  The following keywords are not supported when using
  add_custom_command(TARGET): DEPENDS

As it turns out, this form of `add_custom_command` does not accept
DEPENDS, but versions of CMake prior to 3.31 silently dropped it.

Source/Core/MacUpdater/CMakeLists.txt

@@ -47,7 +47,6 @@ foreach(sb ${STORYBOARDS})
   set(input  ${CMAKE_CURRENT_SOURCE_DIR}/${sb})
   add_custom_command(TARGET MacUpdater POST_BUILD
     COMMAND ${IBTOOL} --errors --warnings --notices --output-format human-readable-text --compile ${output} ${input}
-    DEPENDS ${input}
     COMMENT "Compiling Storyboard ${sb}...")
 endforeach()