[libvirt] avoid "make rpm" failure in doc/

[Eric Blake]

According to Jim Meyering on 2/25/2010 6:27 AM:
> * docs/Makefile.am (libvirt-api.xml libvirt-refs.xml): Generalize
> apibuild.py to work in a non-srcdir build.  Pass "srcdir" to it.
> * docs/apibuild.py (rebuild): Honor the $srcdir envvar.

ACK.

> Add missing rule to build html/libvirt-libvirt.html.
> Use a GNU Make pattern rule to avoid running apibuild.py once
> for each out-of-date target, in a parallel build.
> * docs/Makefile.am

ACK.

> FYI, I've just pushed these and the unused-var fix.
> Of course, if anything comes out in review, I'll deal with it.

I didn't see any obvious problems, and can still build, so I think you are
okay.

-- 
Eric Blake   eblake at redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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