Restore part of a patch lost in the last libxml2 update which is still
relevant. Reapplying it fixes segfaults caused by itstool, e.g., when
building editors/pluma, which is PR pkg/56229 from Andrius V.
Quoting from wiz@'s original commit from Jan 9, 2019, which covers
everything else:
"In some cases, invalid UTF-8 strings were returned which caused
Python interpreter crashes. See
itstool/itstool#22
Use a variant of the patch that was used in Fedora.
Bump PKGREVISION."
Fedora is still carrying this patch as-is.
(Also, evidently distinfo was not regenerated properly after the last
update, so there's a diff applied to it unrelated to this change set.)
70515eef23