Remove asm from prelude, drop feature

asm has been stabilized in Rust 1.59.0. It is now available in
`core::arch` and not the prelude.

Fixes compiling with the 2022-03-18 toolchain now used by Redox.

Signed-off-by: Tim Crawford <tcrawford@system76.com>

Author: crawfxrd

crates/uefi_std/src/lib.rs

@@ -1,11 +1,9 @@
 #![no_std]
 #![feature(abi_efiapi)]
-#![feature(asm)]
 #![feature(concat_idents)]
 #![feature(core_intrinsics)]
 #![feature(custom_test_frameworks)]
 #![feature(format_args_nl)]
-#![feature(global_asm)]
 #![feature(lang_items)]
 #![feature(log_syntax)]
 #![feature(prelude_import)]
@@ -115,10 +113,8 @@ pub use core::prelude::v1::{
     option_env,
     stringify,
     // Unstable
-    asm,
     concat_idents,
     format_args_nl,
-    global_asm,
     log_syntax,
     trace_macros,
 };

crates/uefi_std/src/prelude.rs

@@ -28,7 +28,6 @@
  // Re-exported built-in macros
  #[doc(no_inline)]
  pub use core::prelude::v1::{
-     asm,
      assert,
      cfg,
      column,
@@ -39,7 +38,6 @@
      file,
      format_args,
      format_args_nl,
-     global_asm,
      include,
      include_bytes,
      include_str,