platform-restrict android code (#591)

* platform-restrict android code

* spelling error

apps/mobile/crates/android/Cargo.toml

@@ -8,7 +8,7 @@ rust-version = "1.64.0"
 # Android can use dynamic linking since all FFI is done via JNI
 crate-type = ["cdylib"]
 
-[dependencies]
+[target.'cfg(target_os = "android")'.dependencies]
 # FFI
 jni = "0.19.0"
 

apps/mobile/crates/android/src/lib.rs

@@ -1,3 +1,5 @@
+#![cfg(target_os = "android")]
+
 use std::panic;
 
 use jni::{