Jextract failure on llvm 17.0.1 with sdl

[Clayton Walker]

Hello,

I've been working on creating a set of bindings against sdl2, and have
encountered the following issue:

Unknown type with same canonical type: __bf16

I wasn't sure what needed to be fixed, perhaps a missing declaration or
mapping in jextract, but after a bit of digging I tried adding the clang
BFloat16 data type but had no luck.
https://github.com/openjdk/jextract/compare/jdk21...Sineaggi:jextract:jdk-21-bf16
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