Switch to purely namespaced enums

This breaks code that referred to variant names in the same namespace as
their enum. Reexport the variants in the old location or alter code to
refer to the new locations:

```
pub enum Foo {
    A,
    B
}

fn main() {
    let a = A;
}
```
=>
```
pub use self::Foo::{A, B};

pub enum Foo {
    A,
    B
}

fn main() {
    let a = A;
}
```
or
```
pub enum Foo {
    A,
    B
}

fn main() {
    let a = Foo::A;
}
```

[breaking-change]

1 files changed, 2 insertions, 0 deletions

diff --git a/src/libstd/sys/windows/timer.rs b/src/libstd/sys/windows/timer.rs
index f507be2a985..9af3a7c8b6e 100644
--- a/src/libstd/sys/windows/timer.rs
+++ b/src/libstd/sys/windows/timer.rs
@@ -20,6 +20,8 @@
 //! Other than that, the implementation is pretty straightforward in terms of
 //! the other two implementations of timers with nothing *that* new showing up.
 
+pub use self::Req::*;
+
 use libc;
 use ptr;
 use comm;