snap: use a local patch for pyscard

.github/workflows/snap-pyscard-patch.patch

@@ -0,0 +1,22 @@
+From 6dd501199c1323a49f2e64e75c886a1d0b652577 Mon Sep 17 00:00:00 2001
+From: Dag Heyman <dag@yubico.com>
+Date: Thu, 20 Feb 2020 18:05:59 +0100
+Subject: [PATCH] setup.py: add typical snapcraft location of PCSC
+
+---
+ setup.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/setup.py b/setup.py
+index 939e60f..ba54c7c 100755
+--- a/setup.py
++++ b/setup.py
+@@ -76,7 +76,7 @@
+     platform_swig_opts = ['-DPCSCLITE']
+     platform_sources = []
+     platform_libraries = []
+-    platform_include_dirs = ['/usr/include/PCSC', '/usr/local/include/PCSC']
++    platform_include_dirs = ['/root/stage/usr/include/PCSC']
+     platform_extra_compile_args = []    # ['-ggdb', '-O0']
+     platform_extra_link_args = []   # ['-ggdb']
+ 

snap/snapcraft.yaml

@@ -110,7 +110,12 @@ parts:
     override-build: |
       eval "$(pyenv init -)"
       pyenv global 3.8.1
-      pip3 install git+git://github.com/dagheyman/pyscard.git#egg=pyscard
+      pip3 download --no-binary :all: pyscard
+      tar -xvf pyscard*
+      cd pyscard*
+      patch setup.py ../.github/workflows/snap-pyscard-patch.patch
+      pip3 install .
+      cd ..
       pip3 install -r requirements.txt
     override-stage: |
       snapcraftctl stage