fix rpass core-run-destroy for android

Author: ksh8281

src/test/run-pass/core-run-destroy.rs

@@ -37,9 +37,12 @@ fn test_destroy_twice() {
 
 fn test_destroy_actually_kills(force: bool) {
 
-    #[cfg(unix)]
+    #[cfg(unix,not(target_os="android"))]
     static BLOCK_COMMAND: &'static str = "cat";
 
+    #[cfg(unix,target_os="android")]
+    static BLOCK_COMMAND: &'static str = "/system/bin/cat";
+
     #[cfg(windows)]
     static BLOCK_COMMAND: &'static str = "cmd";