We implicitly require it for building ragel subproject. This new version
requirement should satisfied in both Fedora 33 and Debian bullseye, and
not be too cutting edge for us.
Test that both NFC and NFD input produces identical results for fonts
that used composed fonts internally (Amiri here) and fonts that
decompose internally (Noto Nastaliq Urdu here) and that for the former
composed forms are used.
See https://github.com/harfbuzz/harfbuzz/issues/3179
No idea why test names are underscorified but it it just makes calling
meson test testname harder than it should being not able to copy file
name directly.
Behdad Esfahbod
Khaled Hosny
David Corbett