Do not error on USE_SCOPED_HEADER_INSTALL_DIR

[Timple]

Prevents:

CMake Error at /opt/ros/kilted/share/ament_cmake_core/cmake/core/ament_package.cmake:74 (message):
  ament_package() called with unused arguments: USE_SCOPED_HEADER_INSTALL_DIR
Call Stack (most recent call first):
  /opt/ros/kilted/share/ament_cmake_core/cmake/core/ament_package.cmake:68 (_ament_package)
  /opt/ros/kilted/share/ament_cmake_auto/cmake/ament_auto_package.cmake:110 (ament_package)
  CMakeLists.txt:70 (ament_auto_package)

In cases where a package is maintained for kilted, rolling & jazzy on the same branch.

This can be reverted after Jazzy is EOL.

Relates to: #577

[Timple]

ping 🙂 mile: