Beta warning on winapi 0.2.5

[DoumanAsh]

In case if you haven't found it yet:

C:\Users\appveyor\.cargo\registry\src\github.com-48ad6e4054423464\winapi-0.2.5\src\macros.rs:159:46: 159:47 warning: `$fieldtype:ty` is followed by `[`, which is not allowed for `ty` fragments 
C:\Users\appveyor\.cargo\registry\src\github.com-48ad6e4054423464\winapi-0.2.5\src\macros.rs:159     ($base:ident $field:ident: $fieldtype:ty [ 
                                                                                                                                              ^ 
C:\Users\appveyor\.cargo\registry\src\github.com-48ad6e4054423464\winapi-0.2.5\src\macros.rs:159:46: 159:47 note: The above warning will be a hard error in the next release. 
C:\Users\appveyor\.cargo\registry\src\github.com-48ad6e4054423464\winapi-0.2.5\src\macros.rs:159     ($base:ident $field:ident: $fieldtype:ty [ 

[retep998]

The issue was already discovered, and an RFC to fix it was proposed, accepted, and implemented. Thanks for your concern though.

[DoumanAsh]

Oh... that's good. These warnings that'll become errors always look scary :)