...after 5aab2900 "tdf#109142: Update to
HarfBuzz 1.4.8".  The parts that were still relevant for 'make check' are:

* 6694ce6b "external/harfbuzz: Work around ASan
  out of bounds warning"

* 99f7aacd "external/harfbuzz:
  -fsanitize=function"

* ca9a08bb "external/harfbuzz: Silence
  -fsanitize=nonnull-attribute" (plus 83a9c8e0
  "build fix")

Change-Id: Ibff2a7c52c5de60ae00744acd2ef481bbb08706c