Update kfw installer OS version checks

Require XP SP3 or Vista SP2 or Windows 7 or Server 2003 or Server 2008

Signed-off-by: Kevin Wasserman <kevin.wasserman@painless-security.com>

(cherry picked from commit 00f5923dd95dac8d98d4058887d144602bbd1f9f)

https://github.com/krb5/krb5/commit/91a621bc47912d84e6389c930c739176cab961e7
Author: Kevin Wasserman <kevin.wasserman@painless-security.com>
Committer: Tom Yu <tlyu@mit.edu>
Commit: 91a621bc47912d84e6389c930c739176cab961e7
Branch: krb5-1.10
 src/windows/installer/wix/kfw.wxs               |    4 +++-
 src/windows/installer/wix/lang/strings_1033.wxl |    4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)