[Libvir] Please check my autoconf libvirt.m4

[Richard W.M. Jones]

Thanks Jim, Dan.  Discussing this has clarified my thinking on this a lot.

Originally I wanted to test whether a particular instance of libvirt had 
support for the remote driver.  Since the drivers don't usually export 
symbols directly from the library, it seemed that what I needed was a 
version check function.  In fact that's wrong: even later versions of 
libvirt could be compiled --without-FEATURE.  The only way to do this 
reliably is to test for presence of drivers at runtime.  virGetVersion 
allows me to do this for drivers.

Having said that, I think AC_LIBVIRT_PYTHON could be a useful check for 
virt-manager.

Rich.

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