[libvirt] Miscellaneous fixes to build with -Werror

[Charles Duffy]

HACKING suggests compiling with --enable-compile-warnings=error before 
submitting any patches; however, current master fails for me on this 
account (CentOS 5.3; gcc 4.1.2).

Please see attached. I suspect most of these should be uncontroversial 
-- but wonder if perhaps virStrcpy uses would be better converted to 
virStrcpyStatic rather than adding virStrcpy to the symbol list as done 
here, and am curious about whether the need for explicit initialization 
to silence a warning regarding qemudSetLogging's log_level indicates a 
bug in the macro later used to assign that value.
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