Update to rustix 0.26.2. (#3521)

This pulls in a fix for Android, where Android's seccomp policy on older
versions is to make `openat2` irrecoverably crash the process, so we have
to do a version check up front rather than relying on `ENOSYS` to
determine if `openat2` is supported.

And it pulls in the fix for the link errors when multiple versions of
rsix/rustix are linked in.

And it has updates for two crate renamings: rsix has been renamed to
rustix, and unsafe-io has been renamed to io-extras.

crates/c-api/Cargo.toml

@@ -29,7 +29,7 @@ wat = { version = "1.0.36", optional = true }
 # Optional dependencies for the `wasi` feature
 wasi-cap-std-sync = { path = "../wasi-common/cap-std-sync", optional = true }
 wasmtime-wasi = { path = "../wasi", optional = true }
-cap-std = { version = "0.19.1", optional = true }
+cap-std = { version = "0.21.1", optional = true }
 
 [features]
 default = ['jitdump', 'wat', 'wasi', 'cache']