Fix build with Apple clang & C++17 (bessel functions not defined) #978
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The cyl_bessel_i function isn't defined if you're building with clang, but MathHelpers assumes it is as long as you're using C++17. So we need to add a check for that feature.
I tested this on an Intel Mac. CMake identifies the compiler as "AppleClang 12.0.5.12050022."
I added
to the root CMakeLists.txt, and I ran