configure: define WIN32_LEAN_AND_MEAN early to make it effective

configure: define WIN32_LEAN_AND_MEAN early to make it effective

This macro makes windows builds faster and helps with the old "#define
interface struct" issue as the word "interface" is part of libusb-0.1
API. However, defining it in replacements.h is too late, as windows.h
gets included by that time from somewhere else.

This solution is provided by Ray Donnelly from the MSYS2 team.

Change-Id: I376a5fb3d106786515d7e1ba44dbd751e4dcdb1b
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/2486
Tested-by: jenkins
Reviewed-by: Xiaofan <xiaofanc@gmail.com>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>