Regenerate distinfo after r403842.

> svn-all-fast-export-svn2git-1.0.11.a.20151201-d4ff0b2_GH0.tar.xz is not in /usr/ports/devel/svn2git/distinfo.

> Either /usr/ports/devel/svn2git/distinfo is out of date, or

> svn-all-fast-export-svn2git-1.0.11.a.20151201-d4ff0b2_GH0.tar.xz is spelled incorrectly.

Hash and size are still the same, only the file name has changed.