remove dependency to hermit-abi

- use directly libc as platform interface

Cargo.toml

@@ -47,10 +47,10 @@ net = []
 log = { version = "0.4.8", optional = true }
 
 [target.'cfg(unix)'.dependencies]
-libc = "0.2.149"
+libc = "0.2.159"
 
 [target.'cfg(target_os = "hermit")'.dependencies]
-libc = { package = "hermit-abi", version = "0.3.9" }
+libc = "0.2.159"
 
 [target.'cfg(windows)'.dependencies.windows-sys]
 version = "0.52"
@@ -67,7 +67,7 @@ features = [
 
 [target.'cfg(target_os = "wasi")'.dependencies]
 wasi = "0.11.0"
-libc = "0.2.149"
+libc = "0.2.159"
 
 [dev-dependencies]
 env_logger = { version = "0.9.3", default-features = false }