libusb: Update version from 1.0.19 to 1.0.21

Change-log from file `[ChangeLog][1]`:

> 2016-10-01: v1.0.21:
> * Core: Refactor code related to transfer flags and timeout handling
> * Darwin: Ignore root hub simulation devices
> * Darwin: Improved support for OS X El Capitan
> * Darwin: Work around devices with buggy endpoint descriptors
> * Darwin: Do not use objc_registerThreadWithCollector after its deprecation
> * Darwin: Use C11 atomics on 10.12+ as the OS atomics are now deprecated
> * Linux: Support preallocating kernel memory for zerocopy USB
> * Linux: Deal with receiving POLLERR before all transfers have completed
> * Solaris: Add solaris backend
> * Windows: Add Visual Studio 2015 support
> * Windows: Add usbdk backend
> * Prevent attempts to recursively handle events
> * Fix race condition in handle_timeout()
> * Allow transferred argument to be optional in bulk APIs
> * Various other bug fixes and improvements
>
> 2015-09-13: v1.0.20
> * Add Haiku support
> * Fix multiple memory and resource leaks (#16, #52, #76, #81)
> * Fix possible deadlock when executing transfer callback
> * New libusb_free_pollfds() API
> * Darwin: Fix devices not being detected on OS X 10.8 (#48)
> * Linux: Allow larger isochronous transfer submission (#23)
> * Windows: Fix broken builds Cygwin/MinGW builds and compiler warnings
> * Windows: Fix broken bus number lookup
> * Windows: Improve submission of control requests for composite devices
> * Examples: Add two-stage load support to fxload (#12)
> * Correctly report cancellations due to timeouts
> * Improve efficiency of event handling
> * Improve speed of transfer submission in multi-threaded environments
> * Various other bug fixes and improvements
> The (#xx) numbers are libusb issue numbers, see ie:
> https://github.com/libusb/libusb/issues/16

[1]: https://github.com/libusb/libusb/blob/master/ChangeLog

libusb.be0

@@ -1,6 +1,6 @@
 #!/bin/env beesh
 
-# BEE_VERSION libusb-1.0.19-2
+# BEE_VERSION libusb-1.0.21-0
 
 PGRP=( uncategorized )