Auto merge of rust-lang#30118 - alexcrichton:fix-time-again, r=aturon

I believe that because Windows' unit of resolution is 100ns that this unit of
time will ensure that the assertions will hold true as it's representable in the
native format.

cc rust-lang#29970

Author: bors

src/libstd/time/mod.rs

@@ -235,7 +235,7 @@ mod tests {
             let (a, b) = ($a, $b);
             if a != b {
                 let (a, b) = if a > b {(a, b)} else {(b, a)};
-                assert!(a - Duration::new(0, 1) <= b);
+                assert!(a - Duration::new(0, 100) <= b);
             }
         })
     }