bug #35800: Compilation error on certain systems if parport is disabled
* linux_ppdev.h: Conditionalize inclusion of <linux/parport.h> and
<linux/ppdev.h> on HAVE_PARPORT
git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk@1198 81a1dc3b-b13d-400b-aceb-764788c761c2