* ft245r.c: added semaphore workaround for MacOS X,
added pthread_testcancel in reader thread
* configure.ac: added check for TYPE_232H in libftdi (not in libftdi < 0.20)
* avrftdi.c: do not use TYPE_232H if not declared
git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk@1101 81a1dc3b-b13d-400b-aceb-764788c761c2