OpenDLM with heartbeat 1.2.0 and 1.2.1

Hi all,

I just checked in some changes to configure.ac and
src/user/common/dlm_heartbeat.c that allow successful builds with both
pre- and post- heartbeat 1.2.1, and adds a little bit of info to the
summary at the end of the configure pass.  It also includes the small
change suggested by CA to support i586nocx8.

It is based on Stan's config_buff.diff that he sent as an attachment in
mail on 4/29.

It's a bit of a hack, since I'm not very knowledgeable about
configure.ac.  I went ahead and checked it in, though, since it seems to
make things better.  If anyone knows a better way to do what needs to be
done, let me know, and/or have at it yourself.

Also, if anyone knows an easy way to get version numbers for both the
heartbeat source code and the installed heartbeat libraries, I'd be
interested in adding a warning or error if the versions are *different*
from one another.

-- Ben --


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