Export `t!` from the bootstrap lib so bins can use it

src/bootstrap/lib.rs

@@ -122,8 +122,7 @@
 use crate::builder::Kind;
 use crate::config::{LlvmLibunwind, TargetSelection};
 use crate::util::{
-    check_run, exe, libdir, mtime, output, run, run_suppressed, t, try_run, try_run_suppressed,
-    CiEnv,
+    check_run, exe, libdir, mtime, output, run, run_suppressed, try_run, try_run_suppressed, CiEnv,
 };
 
 mod builder;

src/bootstrap/util.rs

@@ -22,6 +22,7 @@
 ///
 /// This is currently used judiciously throughout the build system rather than
 /// using a `Result` with `try!`, but this may change one day...
+#[macro_export]
 macro_rules! t {
     ($e:expr) => {
         match $e {
@@ -37,7 +38,7 @@
         }
     };
 }
-pub(crate) use t;
+pub use t;
 
 /// Given an executable called `name`, return the filename for the
 /// executable for a particular target.