libxml++3 3.0.0 (new formula)
libxml++3 3.0.0 (new formula)

This is the first stable release of libxml++-3.0. ABI and API are
incompatible with libxml++-2.6. These two series of libxml++ can be
installed in parallel. (Taken from release notes)

I expect that the release of GNOME 3.20.0 will see the first software
packages switching to this new release series of libxml++.

Both packages will need to be kept around for the foreseeable future.

Closes #48744.

Signed-off-by: Dominyk Tiller <53e438f55903875d07efdd98a8aaf887e7208dd3@gmail.com>

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