Update std.diff so it applies cleanly against libc 0.2.153

Test: git apply patches/std.diff
Bug: None
Change-Id: Iee74d99a3e29b1f6240fc4797bde4cdd17293b9d
diff --git a/patches/std.diff b/patches/std.diff
index 89e65f9..d8e48d3 100644
--- a/patches/std.diff
+++ b/patches/std.diff
@@ -1,15 +1,15 @@
-Index: libc/src/lib.rs
-===================================================================
+diff --git a/src/lib.rs b/src/lib.rs
+index 1b6f0c07..dd9b9df1 100644
 --- a/src/lib.rs
 +++ b/src/lib.rs
-@@ -30,6 +30,10 @@
- )]
- #![cfg_attr(libc_const_extern_fn, feature(const_extern_fn))]
- 
+@@ -24,6 +24,10 @@
+ #![cfg_attr(feature = "rustc-dep-of-std", no_core)]
+ #![cfg_attr(libc_const_extern_fn_unstable, feature(const_extern_fn))]
+
 +// ANDROID: Use std to allow building as a dylib.
 +#[cfg(android_dylib)]
 +extern crate std;
 +
  #[macro_use]
  mod macros;
- 
+