Brian Anderson effad62bc5 Add the build date to the reported version. #21957
rustc --version says

```
rustc 1.0.0-dev (d0e82a68a 2015-02-05) (built 2015-02-11)
```
2015-02-13 14:30:04 -08:00
..
2015-02-01 14:41:38 +01:00
2015-01-23 21:04:10 -08:00
2014-12-16 17:08:49 +01:00
2015-01-08 17:03:40 -08:00
2015-01-03 09:49:51 +01:00
2013-10-29 16:22:08 -07:00
2015-01-12 10:09:47 +02:00
2014-12-11 15:33:27 -07:00
2014-02-14 19:17:50 -08:00