[Libvir] PATCH: Fix qemu-dm path in capabilities info

[Richard W.M. Jones]

Daniel P. Berrange wrote:
> The current Xen capabilities XML data chooses between /usr/lib/xen/bin/qemu-dm
> and /usr/lib64/xen/bin/qemu-dm based on whether the guest arch is 64 bit.
> This is incorrect because the path is actually determined based on the host
> OS. Only x86_64 uses /usr/lib64, all other arches just use /usr/lib - even
> on ia64. So this patch changes the logic so that /usr/lib64 is only used if
> we see an x86_64 guest present - this implies host is x86_64 and that all
> guests whether 32 or 64bit shoudl use /usr/lib64

Actually Debian uses /usr/lib too on all architectures (in fact I'm not 
sure which other Linux systems use /usr/lib64 - it's very peculiar to 
Red Hat).

However Debian symlinks /usr/lib64 -> /usr/lib, presumably for 
compatibility with whoever thought using /usr/lib64 was a good idea in 
the first place.  Unix managed to transition from 16 to 32 bits without 
adding '*32' everywhere, I'm not sure why this time is different ...

Rich.

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