[HarfBuzz] Windows 10 monbaiti.ttf upgrade (5.01 -> 5.51) caused loss of diacritical marks when shaped with harfbuz

[Tom Hindle]

Hi,

I noticed in windows 10 that when using System Mongolian Baiti Font, text
shaping via harfbuz (seen in firefox + chrome) no longer displayed the dots
bellow the words.

Tested using hg-view.exe using harfbuz 1.1.2

Attached pngs of output from hb-view using both the windows 10 font (5.51)
and the windows 7 font (5.01).


hb-view.exe Windows7Font_monbaiti.ttf --text-file=Mongolian.txt
outtput-format=png --output-file=file-monbaiti_5.01-harfbuzz-1.1.2.png

hb-view.exe Windows10Font_monbaiti.ttf --text-file=Mongolian.txt
outtput-format=png --output-file=file-monbaiti_5.51-harfbuzz-1.1.2.png

Installing the Windows 7 font on windows 10 fixed the behavior in harfbuz
based application (eg. firefox).

Windows 10's IE (11) + Edge both displayed the dots regardless of which
font was used.

Thanks
Tom
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