When I introduced headers separation (aka includes-revamp branch), the libnfc source code includes have been changed from '#include "../xx/nfc*.h"' to '#include <nfc/nfc*>' (when compiling, the source include dir (src/include) has precedence over '${prefix}/include'). For the sake of consistency, update libnfc.pc includedir so that compiling third party code using '#include <nfc/nfc*>' just works (tm). This provides much more consistent headers since they are usually referred relative to the includedir (exceptions are e.g. glib, gtk, xorg... quite bigger than libnfc I could say).
