libusb: update to 1.0.26

libusb: update to 1.0.26

Add libatomic as dependency.

Changelog:
2022-04-10: v1.0.26
* Fix regression with transfer free's after closing device
* Fix regression with destroyed context if API is misused
* Workaround for applications using missing default context
* Fix hotplog enumeration regression
* Fix Windows isochronous transfer regression since 1.0.24
* Fix macOS exit crash in some multi-context cases
* Build fixes for various platforms and configurations
* Fix Windows HID multi-interface product string retrieval
* Update isochronous OUT packet actual lengths on Windows
* Add interface bound checking for broken devices
* Add umockdev tests on Linux

Signed-off-by: Nick Hainke <vincent@systemli.org>