Fix thread::available_parallelism on WASI targets
The refactoring in ba462864f11 ("std: Use more unix.rs code on WASI
targets") moved WASI from its own thread module into the shared unix.rs
module. However, it did not carry over the available_parallelism()
implementation for WASI, causing it to fall through to the unsupported
catch-all. This silently regressed the support originally added in
f0b7008648d.
Fix this by adding WASI to the sysconf-based cfg_select arm alongside
other platforms that use libc::sysconf(_SC_NPROCESSORS_ONLN). This
delegates to wasi-libc, which currently always returns 1 but opens up
the possibility for wasi-libc to report actual processor counts in the
future.
This requires libc to export _SC_NPROCESSORS_ONLN for WASI targets,
which has been added in libc 0.2.184.
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