oakaudio: drop cpal's `asio` feature. asio-sys needs the proprietary
Steinberg ASIO SDK at link time (undefined ASIOGetSamplePosition etc.
on the GNU toolchain); WASAPI remains the Windows backend.
ci: the failure-only gdb step passed test args without --args, so gdb
treated --nocapture as a core file. Also collect loader-stage evidence
for the copier_test dl_main SIGSEGV: IRELATIVE reloc count, LD_DEBUG
tail, full backtrace and registers.
Mike-Solar
e837277557