fix compile error

[mcdallas]

error[E0658]: imports can only refer to extern crate names passed with `--extern` on stable channel (see issue #53130)   
  --> apiwallet/src/lib.rs:37:9                                                                                          
   |                                                                                                                     
36 | pub mod api;                                                                                                        
   | ------------ not an extern crate passed with `--extern`                                                             
37 | pub use api::{APIForeign, APIOwner};                                                                                
   |         ^^^                                                                                                         
   |                                                                                                                     
note: this import refers to the module defined here                                                                      
  --> apiwallet/src/lib.rs:36:1                                                                                          
   |                                                                                                                     
36 | pub mod api;                                                                                                        
   | ^^^^^^^^^^^^                                                                                                        
                                                                                                                         
error: aborting due to previous error                                                                                    
                                                                                                                         
For more information about this error, try `rustc --explain E0658`.                                                      
error: Could not compile `grin_apiwallet`.   

[yeastplume]

confused since this built fine locally and passed travis tests and produced a build.. what version of rust are you using?

[jaspervdm]

I can confirm that I get this compilation error on Windows, adding crate:: fixed it.

[yeastplume]

ahhh... windows...

[mcdallas]

I'm on Ubuntu using rust 1.31.1 stable