librustrt: check for mips+linux config in stack_overflow

Author: jxv

src/librustrt/stack_overflow.rs

@@ -283,6 +283,7 @@ mod imp {
     #[cfg(any(all(target_os = "linux", target_arch = "x86"), // may not match
               all(target_os = "linux", target_arch = "x86_64"),
               all(target_os = "linux", target_arch = "arm"), // may not match
+              all(target_os = "linux", target_arch = "mips"), // may not match
               target_os = "android"))] // may not match
     mod signal {
         use libc;