It is possible to simply read the 'version_string' variable, but it
seems better to add a proper API call to get this. It is already
defined in lib/ulib/ulib.c
Add a prototype to u-boot-lib.h
Make use of it from the demo program.
Fix the comment for ulib_uninit() while we are here.
Signed-off-by: Simon Glass <sjg@chromium.org>
1db2a3f13b