Replace ignore-android with ignore-cross-compile in rustdoc tests

The problem is that rustdoc searches for external crates using the host
triple, not the target triple. It's actually unclear to me whether this is
correct behavior or not, but it is necessary to get cross-compiled tests
working.

Author: rprichard

src/test/rustdoc/default-impl.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 // aux-build:rustdoc-default-impl.rs
-// ignore-android
+// ignore-cross-compile
 
 extern crate rustdoc_default_impl as foo;
 

src/test/rustdoc/extern-default-method.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 // aux-build:rustdoc-extern-default-method.rs
-// ignore-android
+// ignore-cross-compile
 
 extern crate rustdoc_extern_default_method as ext;
 

src/test/rustdoc/extern-method.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 // aux-build:rustdoc-extern-method.rs
-// ignore-android
+// ignore-cross-compile
 
 #![feature(unboxed_closures)]
 

src/test/rustdoc/ffi.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 // aux-build:rustdoc-ffi.rs
-// ignore-android
+// ignore-cross-compile
 
 extern crate rustdoc_ffi as lib;
 

src/test/rustdoc/inline-default-methods.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 // aux-build:inline-default-methods.rs
-// ignore-android
+// ignore-cross-compile
 
 extern crate inline_default_methods;
 

src/test/rustdoc/issue-13698.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 // aux-build:issue-13698.rs
-// ignore-android
+// ignore-cross-compile
 
 extern crate issue_13698;
 

src/test/rustdoc/issue-15318-2.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 // aux-build:issue-15318.rs
-// ignore-android
+// ignore-cross-compile
 
 extern crate issue_15318;
 

src/test/rustdoc/issue-15318.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 // aux-build:issue-15318.rs
-// ignore-android
+// ignore-cross-compile
 
 #![feature(no_std)]
 #![no_std]

src/test/rustdoc/issue-17476.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 // aux-build:issue-17476.rs
-// ignore-android
+// ignore-cross-compile
 
 extern crate issue_17476;
 

src/test/rustdoc/issue-19190-3.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 // aux-build:issue-19190-3.rs
-// ignore-android
+// ignore-cross-compile
 
 extern crate issue_19190_3;