libvirt: uprev to v6.1.0

Updating libvirt to the next major release series. With this, brings
some changes to the build:

 - add python3-docutils-native to DEPENDS, since it is needed for doc
   building
 - remove a reference to libgnu.la from the Makefiles, since it is not
   needed or provided in the build dependencies
 - remove obselete packageconfig options: xenapi and phyp
 - add an explicit do_compile rule (versus the autotools bbclass
   variant), so we can create some directories before compilation
   starts
 - add ${B}/src to the PKG_CONFIG_PATH to the libvirt.pc file can be
   found during build, as it is queried by libvirt-python
 - with the ability to find the libvirt.pc file, we can also drop the
   manipulations for libvirt_api_xml_path, as it is returned from
   pkg-config queries.
 - clear PKG_CONFIG_SYSROOT_DIR during libvirt-python builds, since
   the libvirt.pc file already provides cflags/includes that are
   contained to the build/src directory structure.

And finally, existing patches are refreshed to remove fuzz.

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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