libusbredir: Update to version 0.15.0

libusbredir: Update to version 0.15.0

- Update from version 0.13.0 to 0.15.0
- Update of rootfile not required
- Changelog
    0.15.0
	- !74 usbredirect: Fix crash with multiple connections
	- !73 usbredirect: Fix win32 cross-compile warning
	- usbredirtestclient: Fix memory leak
    0.14.0
	- !67 usbredirect: Fix redirecting identical devices
	- !64 usbredirect: Fix CPU tight loop when run as TCP server
	- !68 usbredirect: Fix some minor memory leaks
	- !65 usbredirect: Add documentation about bus-device option
	- !70 usbredirtestclient: Fix build on MacOS 10.5

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>