Document the process of using buildroot to build a big-endian
binary of OpenOCD and using QEMU User Mode Emulation for running
the big-endian binary on a little-endian host PC.
Change-Id: Ic5fe26e353a4cf69e57af3c23ae7fa4b25347b2b
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/6968
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>