auto merge of #10458 : yichoi/rust/make_check_pass_android2, r=brson

To enable test on android bot #9120

 workcache::test disabled and run-pass/core-run-destroy.rs fixed on android

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

@@ -22,13 +22,23 @@ use std::io;
 
 #[test]
 fn test_destroy_once() {
-    let mut p = run::Process::new("echo", [], run::ProcessOptions::new());
+    #[cfg(not(target_os="android"))]
+    static PROG: &'static str = "echo";
+    #[cfg(target_os="android")]
+    static PROG: &'static str = "ls"; // android don't have echo binary
+
+    let mut p = run::Process::new(PROG, [], run::ProcessOptions::new());
     p.destroy(); // this shouldn't crash (and nor should the destructor)
 }
 
 #[test]
 fn test_destroy_twice() {
-    let mut p = run::Process::new("echo", [], run::ProcessOptions::new());
+    #[cfg(not(target_os="android"))]
+    static PROG: &'static str = "echo";
+    #[cfg(target_os="android")]
+    static PROG: &'static str = "ls"; // android don't have echo binary
+
+    let mut p = run::Process::new(PROG, [], run::ProcessOptions::new());
     p.destroy(); // this shouldnt crash...
     do io::io_error::cond.trap(|_| {}).inside {
         p.destroy(); // ...and nor should this (and nor should the destructor)

src/test/run-pass/x86stdcall.rs

@@ -33,4 +33,5 @@ pub fn main() {
 #[cfg(target_os = "macos")]
 #[cfg(target_os = "linux")]
 #[cfg(target_os = "freebsd")]
+#[cfg(target_os = "android")]
 pub fn main() { }