Test fallback on Linux/Andorid

Signed-off-by: Joe Richey <[email protected]>

Author: josephlr

src/linux_android_with_fallback.rs

@@ -27,3 +27,8 @@ fn is_getrandom_available() -> bool {
         true
     }
 }
+
+#[cfg(test)]
+mod fallback {
+    crate::tests::define_tests!(super::use_file::getrandom_inner);
+}