Fix for crash in Freetype code. Check the return value of the
FT_Get_Glyph() function. See
https://bz.apache.org/ooo/show_bug.cgi?id=127929 [1]

Ensure that unowinreg.dll is included in DISTFILES when running the
makesum and distclean targets.

PR: 233404 [1]
Obtained from: upstream [1]
MFH: 2018Q4