Windows messages when atomic type is unsupported

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This PR uses a default value if ROS_PACKAGE_NAME is not set, which appears to be the case for rclpy. Also it adds a compile time message when an atomic type is not supported in addition to the existing runtime error. (Edit, second part makes no sense. See comment below)

From https://ci.ros2.org/job/ci_windows/6471/consoleText

(ClCompile target) -> 
  C:\J\workspace\ci_windows\ws\install\include\rcutils/stdatomic_helper.h(90): error C2065: 'ROS_PACKAGE_NAME': undeclared identifier [C:\J\workspace\ci_windows\ws\build\rclpy\rclpy_signal_handler.vcxproj]
  C:\J\workspace\ci_windows\ws\install\include\rcutils/stdatomic_helper.h(98): error C2065: 'ROS_PACKAGE_NAME': undeclared identifier [C:\J\workspace\ci_windows\ws\build\rclpy\rclpy_signal_handler.vcxproj]
  C:\J\workspace\ci_windows\ws\install\include\rcutils/stdatomic_helper.h(106): error C2065: 'ROS_PACKAGE_NAME': undeclared identifier [C:\J\workspace\ci_windows\ws\build\rclpy\rclpy_signal_handler.vcxproj]
  C:\J\workspace\ci_windows\ws\install\include\rcutils/stdatomic_helper.h(114): error C2065: 'ROS_PACKAGE_NAME': undeclared identifier [C:\J\workspace\ci_windows\ws\build\rclpy\rclpy_signal_handler.vcxproj]
  C:\J\workspace\ci_windows\ws\install\include\rcutils/stdatomic_helper.h(128): error C2065: 'ROS_PACKAGE_NAME': undeclared identifier [C:\J\workspace\ci_windows\ws\build\rclpy\rclpy_signal_handler.vcxproj]
  C:\J\workspace\ci_windows\ws\install\include\rcutils/stdatomic_helper.h(139): error C2065: 'ROS_PACKAGE_NAME': undeclared identifier [C:\J\workspace\ci_windows\ws\build\rclpy\rclpy_signal_handler.vcxproj]
  C:\J\workspace\ci_windows\ws\install\include\rcutils/stdatomic_helper.h(147): error C2065: 'ROS_PACKAGE_NAME': undeclared identifier [C:\J\workspace\ci_windows\ws\build\rclpy\rclpy_signal_handler.vcxproj]
  C:\J\workspace\ci_windows\ws\install\include\rcutils/stdatomic_helper.h(155): error C2065: 'ROS_PACKAGE_NAME': undeclared identifier [C:\J\workspace\ci_windows\ws\build\rclpy\rclpy_signal_handler.vcxproj]
  C:\J\workspace\ci_windows\ws\install\include\rcutils/stdatomic_helper.h(163): error C2065: 'ROS_PACKAGE_NAME': undeclared identifier [C:\J\workspace\ci_windows\ws\build\rclpy\rclpy_signal_handler.vcxproj]
  C:\J\workspace\ci_windows\ws\install\include\rcutils/stdatomic_helper.h(171): error C2065: 'ROS_PACKAGE_NAME': undeclared identifier [C:\J\workspace\ci_windows\ws\build\rclpy\rclpy_signal_handler.vcxproj]

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CI (packages above rcutils, windows only since this header is only included on that platform)

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Not sure what I was thinking with the #pragma message, it makes no sense because the preprocessor can't know the size of the types and the logic is done at runtime using a switch statement. Removed the build time messages in 66a1041

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CI (windows only, testing packages above rcutils)

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One more time with CI

ab9ea67 removed the undef of _RCUTILS_PACKAGE_NAME. IIUC it can't be undef'd because the macros using it still refer to it.

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Only test_params_yaml ros2/build_farmer#166 failed. I'm assuming ab9ea67 did not change anyone's mind about approving and merging.