[libvirt] [PATCH 0/3] Add further testing of SELinux security driver

This patch series expands on previous work to test the SELinux security driver via a LD_PRELOAD hack. This time we are testing the file labelling, by setting/getting private xattrs, instead of the actual SELinux xattrs. In doing this I had need to use libattr, and got fed up with duplicating the usual m4 black magic. Thus I wrote a helper macro for simplifying library checks, and then a further macro for the actual libattr check. The configure.ac file thus only gains two lines LIBVIRT_CHECK_LIBATTR ... LIBVIRT_RESULT_LIBATTR In the long run, I'd like to replace all our existing library checks with these macros, to try & get our configure.ac script back to a reasonable level of sanity.