devel/pcsc-lite: Update port to 1.8.21
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 isnt enough for response.
pcsc-spy:
. add support of Python 3

Reviewed by: mat (mentor)
Approved by: mat (mentor)
Differential Revision: https://reviews.freebsd.org/D10914