Clang.jl wrapper generation warnings/missing parts

General Usage
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I also noticed GraphBLAS use new C99 features like:

https://github.com/sergiud/SuiteSparse/blob/6a80a5aa17c3d6c11224b2d24cc28c7833b66408/GraphBLAS/Include/GraphBLAS.h#L2729-L2758

Clang.jl cannot handle this, but I guess it’s easy to rewrite these macros as pure Julia macro since Julia macro supports overloading and multiple dispatch.