Merge pull request #523 from nikarh/vita

Author: JohnTitor

src/backtrace/libunwind.rs

@@ -158,7 +158,8 @@ mod uw {
             not(all(target_os = "android", target_arch = "arm")),
             not(all(target_os = "freebsd", target_arch = "arm")),
             not(all(target_os = "linux", target_arch = "arm")),
-            not(all(target_os = "horizon", target_arch = "arm"))
+            not(all(target_os = "horizon", target_arch = "arm")),
+            not(all(target_os = "vita", target_arch = "arm")),
         ))] {
             extern "C" {
                 pub fn _Unwind_GetIP(ctx: *mut _Unwind_Context) -> libc::uintptr_t;