xterm: 308 -> 320

Upgrade xterm from 308 to 320.

1) Modify LIC_FILES_CHKSUM,since the date in it has been changed, But the LICENSE has not been changed.
2) Fix WARNING: QA Issue: xterm rdepends on libxinerama, but it isn't a build dependency? [build-deps]

Signed-off-by: Li Xin <lixin.fnst@cn.fujitsu.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>