Remove libnative

With runtime removal complete, there's nothing left of libnative. This
commit removes it.

Fixes rust-lang#18687

[breaking-change]

mk/crates.mk

@@ -49,7 +49,7 @@
 # automatically generated for all stage/host/target combinations.
 ################################################################################
 
-TARGET_CRATES := libc std green native flate arena term \
+TARGET_CRATES := libc std green flate arena term \
                  serialize sync getopts collections test time rand \
                  log regex graphviz core rbml alloc rustrt \
                  unicode
@@ -67,7 +67,6 @@ DEPS_std := core libc rand alloc collections rustrt sync unicode \
 	native:rust_builtin native:backtrace
 DEPS_graphviz := std
 DEPS_green := std native:context_switch
-DEPS_native := std
 DEPS_syntax := std term serialize log fmt_macros arena libc
 DEPS_rustc_trans := rustc rustc_back rustc_llvm libc
 DEPS_rustc := syntax flate arena serialize getopts rbml \
@@ -95,9 +94,9 @@ DEPS_regex := std
 DEPS_regex_macros = rustc syntax std regex
 DEPS_fmt_macros = std
 
-TOOL_DEPS_compiletest := test getopts native
-TOOL_DEPS_rustdoc := rustdoc native
-TOOL_DEPS_rustc := rustc_trans native
+TOOL_DEPS_compiletest := test getopts
+TOOL_DEPS_rustdoc := rustdoc
+TOOL_DEPS_rustc := rustc_trans
 TOOL_SOURCE_compiletest := $(S)src/compiletest/compiletest.rs
 TOOL_SOURCE_rustdoc := $(S)src/driver/driver.rs
 TOOL_SOURCE_rustc := $(S)src/driver/driver.rs

src/driver/driver.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![no_start]
+
 #[cfg(rustdoc)]
 extern crate "rustdoc" as this;