>From upstream developer Sergei Petrunia: "fix-FTBFS-on-GNU-Hurd.patch - adjusted and applied (patch-to-that patch, fix for debian bug# 882062 is applied as well)"
Source: https://jira.mariadb.org/browse/MDEV-14900#comment-113248 That Jira instance is not integrated with Github, so I cannot easily see what commit it was applied in and when it is released, but hopefully it will be part of next 10.0 release.