ccid: strip shared object to reduce closure size

The ccid derivation provides a pcsclite plugin to access CCID devices.
This shared object is written to a non-standard path "$out/pcsc", which
causes it not to get stripped by default. The consequence is that the
result is an unstripped binary that still contains references to gcc and
glibc-dev in its debug symbols, which unnecessarily inflates the closure
size from ~80MB to ~400MB.

Explicitly add the directory to the stripped paths to fix this issue.

pkgs/tools/security/ccid/default.nix

···
   nativeBuildInputs = [ pkg-config perl ];
   buildInputs = [ pcsclite libusb1 ];
 
+  # The resulting shared object ends up outside of the default paths which are
+  # usually getting stripped.
+  stripDebugList = ["pcsc"];
+
   meta = with lib; {
     description = "ccid drivers for pcsclite";
     homepage = "https://ccid.apdu.fr/";