Auto merge of #467 - jakllsch:netbsd-sparc64-20161205, r=alexcrichton

Recognize NetBSD/sparc64 as a generic 64-bit NetBSD

Author: bors

src/unix/bsd/netbsdlike/netbsd/other/mod.rs

@@ -1,5 +1,6 @@
 cfg_if! {
-    if #[cfg(target_arch = "x86_64")] {
+    if #[cfg(any(target_arch = "sparc64",
+                 target_arch = "x86_64"))] {
         mod b64;
         pub use self::b64::*;
     } else if #[cfg(any(target_arch = "arm",