Only relevant for C++, but these functions can't throw as it's a C-based API.
Letting the compiler know that helps improve code generation. Extension
callbacks must also not let exceptions leave the callback, or else Bad Things
can happen.
The macro AL_DISABLE_NOEXCEPT may be defined before including the headers to
not mark functions as noexcept, but this should only be done if the caller
can't otherwise be fixed.
libsndfile apparently has issues reading floating-point wave files as 16-bit
samples (produces silence). Even on other file formats, reading float samples
as integer samples has no over/underflow protection, so this is better for
those formats too.
