The version compare function vercmp() was not exatcly conforming to
Debian rules, e.g. it reported 'r1' > 'r1.1' but the Debian rules says
'r1' < 'r1.1'; it didn't support the "~" either.
Modified the vercmp() to meet Debian rules, so that it's compatible to
the rules used in opkg.
This part of the buf fixing of [YOCTO #2233].
(Bitbake rev: 97b610c54c60b5a40fa7f6a09fa23ce17b38f93a)
Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>