[Libvir] [PATCH] Avoid compile failure when HAVE_AVAHI is not defined.

[Richard W.M. Jones]

Jim Meyering wrote:
> Without this patch, building without HAVE_AVAHI fails due to an unguarded
> use of mdns_name.  Rather than adding yet another #ifdef..#endif (ugly
> and less maintainable), I've chosen to un-ifdef the declarations and
> a few uses.  The more code that we compile and use unconditionally,
> the fewer surprises we'll encounter down the road.

Strangely enough I didn't hit this problem when building on Cygwin, and 
I'm pretty sure they don't have avahi?

My only reservation is what happens if mdns_* configuration is in 
libvirtd.conf, but there is no support in the binary.  Should we print 
out an error message or a warning?

General principles though +1

Rich.

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