miniscule issue: missing dependency check for pcsclite

[jowilkes]

Neither autoreconf -fi nor ./configure notice when libpcsclite is missing. make fails in the middle later when the header files aren't found.
Installing libpcsclite-dev.deb solves this issue. That can be deduced; but it's cleaner when all dependencies get checked before make, and missing ones explicitly named.
I'd set this at low priority - just writing it down so it doesn't get lost entirely.