alloc: Split apart the global alloc feature

src/libstd/lib.rs

@@ -107,6 +107,7 @@
 #![feature(allow_internal_unstable)]
 #![feature(associated_consts)]
 #![feature(borrow_state)]
+#![feature(box_raw)]
 #![feature(box_syntax)]
 #![feature(char_internals)]
 #![feature(collections)]
@@ -117,6 +118,7 @@
 #![feature(core_prelude)]
 #![feature(core_simd)]
 #![feature(fnbox)]
+#![feature(heap_api)]
 #![feature(int_error_internals)]
 #![feature(into_cow)]
 #![feature(iter_order)]
@@ -126,6 +128,7 @@
 #![feature(macro_reexport)]
 #![feature(no_std)]
 #![feature(num_bits_bytes)]
+#![feature(oom)]
 #![feature(optin_builtin_traits)]
 #![feature(rand)]
 #![feature(raw)]