Update unicode-bidi to 0.3.7

Test: cd external/rust/crates && atest --host -c
Change-Id: I9bb9a4783210d0899bafb537074a3e81e26a72c5

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib.rs b/src/lib.rs
index 09bbcfb..bb318a0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -66,7 +66,7 @@
 
 #![no_std]
 // We need to link to std to make doc tests work on older Rust versions
-#![cfg(feature = "std")]
+#[cfg(feature = "std")]
 extern crate std;
 #[macro_use]
 extern crate alloc;