autoconfiguration figured out we need it. The private implementation
has already been protected that way.
This should finally really fix bug #17884: another gettimeofday
conflict under win32/cygwin
git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk@669 81a1dc3b-b13d-400b-aceb-764788c761c2