This adds libpcsclite for smartcard support.

This is my first Guix package, and I surely screwed something up. :)
I'd appreciate any help or criticism you can give.  This was not a
trivial change.

The description is taken directly from the website, but I'm not fond
of its emphasis of Windows.  Should I change it?


Previous to this patch, commands like `gpg --card-status` did not work
(gpg version 2.1).  Running the following command would yield the
error "Could not find libpcsclite.so.1":

  gpg-agent --debug-all --debug-level guru --server --no-detach \
    <<< 'SCD SERIALNO openpgp'


I tried running `./pre-inst-env guix lint libpcsclite`, but got an
error about an unbound `make-session` variable; I'll post about that
separately, but please forgive any issues that it might have caught.


Mike Gerwitz (2):
  gnu: Add libpcsclite
  gnu: gnupg: libpcsclite propagated input

 gnu/packages/gnupg.scm | 40 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

-- 
2.9.3