rustc: Default the ~[] lint to allow for now

Most of the standard distribution is still using ~[] instead of Vec, so this
lint is essentially useless currently. When the standard distribution has been
ported to not use ~[], then we can turn the lint back on.

src/librustc/middle/lint.rs

@@ -405,7 +405,7 @@ static lint_table: &'static [(&'static str, LintSpec)] = &[
      LintSpec {
         lint: DeprecatedOwnedVector,
         desc: "use of a `~[T]` vector",
-        default: warn
+        default: allow,
     }),
 ];