New pcsc-lite 1.8.21

Hello,

I just released a new version of pcsc-lite 1.8.21.
pcsc-lite is a Free Software implementation of the PC/SC (or WinSCard)
API for Unix systems.

Changes:
1.8.21: Ludovic Rousseau
20 May 2017
- SCardCancel():
  . fix a race condition bug
  . fix a possible use after free
  . improve Doxygen documentation
- SCardGetStatusChange(): fix a race condition when a reader is removed
- SCardDisconnect(): fix status update for SCARD_UNPOWER_CARD
- pcsc_stringify_error(): use Thread-local storage
- pcsc_stringify_error() now returns a const char *
- SCardControl() may return SCARD_E_INSUFFICIENT_BUFFER when
  pbRecvBuffer is not big enough to receive the card response.
- Fix compilation error with GCC 4.9
- UnitaryTests: add support of Python 3
- pcsc-spy: add support of Python 3
- Some other minor improvements

https://alioth.debian.org/frs/?group_id=30105&release_id=2058
https://ludovicrousseau.blogspot.fr/2017/05/new-version-of-pcsc-lite-1821.html

-- 
 Dr. Ludovic Rousseau

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