performance.
Note that many consumers still read one byte at a time though.
This patch has once been submitted to me by Bernd Walter
<ticso@cicely.de>, minor tweak by me (mainly to get it running under
Linux, too).
git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk@459 81a1dc3b-b13d-400b-aceb-764788c761c2