Update to latest rust

build.rs

src/context/context.rs

src/context/file.rs

src/context/list.rs

src/context/memory.rs

src/context/signal.rs

src/context/timeout.rs

src/elf.rs

src/event.rs

src/lib.rs

src/memory/recycle.rs

src/panic.rs

src/scheme/event.rs

src/scheme/initfs.rs

src/scheme/live.rs

src/scheme/memory.rs

src/scheme/mod.rs

src/scheme/pipe.rs

src/scheme/root.rs

src/scheme/sys/context.rs