audio/snd: Update to 22.9

is7: s7_number_to_real_with_location. s7_wrong_type_error.
s7_make_string_wrapper_with_length. s7_make_semipermanent_string.
CL-style doc strings, (symbol...) settable.

PR: 268360
Reported by: portmaster@bsdforge.com (maintainer)
MFH: 2022Q4 (bugfixes)