Cleanup/CMake: Remove dormant windows codesign code

This was added years ago to prepare for code-signing the executable
but was never used, buildbots use a different mechanism now to sign
so no need to keep this around.

source/creator/CMakeLists.txt

@@ -277,7 +277,6 @@ if(WITH_PYTHON_MODULE)
 
 else()
   add_executable(blender ${EXETYPE} ${SRC})
-  WINDOWS_SIGN_TARGET(blender)
 endif()
 
 if(WITH_BUILDINFO)