configure.ac

jlink modified to use the new usb abstaction layer.
During the configuration process we can select if use
libusb0 or libusb-1.0 library for this driver.

Change-Id: I70bc9ee2f89b7597e0f64ea80cad7f1b9070f01b
Signed-off-by: Mauro Gamba <maurillo71@gmail.com>
Reviewed-on: http://openocd.zylin.com/236


Tested-by: jenkins
Reviewed-by: Xiaofan <xiaofanc@gmail.com>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>