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Update RIOT-rs support

Kaspar Schleiser requested to merge kaspar030/riot-sys:update_riot_rs_support into master

This MR contains some updates for supporting RIOT-rs:

  • a change to build.rs that makes it bail out if BUILDING_RIOT_RS is in env but the riot-rs feature is not selected.

This ensures that RIOT-rs builds don't get build without the feature set (which would fail anyways), and a sane error message is presented to the user. Mostly useful if some dependency crate in a RIOT-rs build selects either riot-wrappers or riot-sys.

  • a change to build.rs, exporting marker_riot_rs to downstream crates
  • lib.rs now depends on and re-exports riot-rs-core, if building for RIOT-rs

These two changes make it possible for riot-wrappers to just re-use the riot-rs support selection from riot-sys, without itself having to depend on riot-rs-core (duplicating all dependency tree checks).

The corresponding riot-wrappers changes: will be PR'ed there shortly. riot-wrappers!9

Edited by Kaspar Schleiser

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