small c++ breakage in current freetype git HEAD

[Hin-Tak Leung]

Hi,

I have upgraded to fc40 last week, and there has been some breakage of 
skia-python against current skia lately, so I thought I'd update and rebuild 
the skia-enabled ft2-demos, now ported over to github CI against freetype git 
head. (next e-mail). Since skia is c++, requires setting CC=c++. Found a small 
breakage in current freetype git head after 2.13.2 . Diff attached - should be 
obvious.

The actual error is that "enum" is a proper type in c++, and not equivalent to 
"int" (as in c), so must be casted as such.

Hin-Tak

freetype2.diff
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