usleep() is not found in all versions of MinGW, use Sleep() on Windows.
Handle long sleeps on non-Windows correctly.

Signed-off-by: Maksim Kuleshov <mmcx@mail.ru>
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stefan Tauner <stefan.tauner@student.tuwien.ac.at>


git-svn-id: svn://flashrom.org/flashrom/trunk@1667 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1