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Skip f16/bf16 bessel specializations on AVX512 if unavailable.

Antonio Sánchezrequested to merge
cantonios/eigen:bessel into master

The bessel functions are not available for AVX512 on msvc prior to 1923 (VS 2019) or old versions of gcc (prior to 5.3). This causes a build error since pexp is not available for these half->float specializations.

Fixes #2499 (closed).

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