Test libretro android build

.github/workflows/rust.yml

@@ -26,6 +26,12 @@ jobs:
         cache-directories: "/home/runner/.cargo/bin
           C:\\Users\\runneradmin\\.cargo\\bin"
 
+    - uses: nttld/setup-ndk@v1
+      id: setup-ndk
+      with:
+        ndk-version: r25  # This is the minimum version rust supports
+        add-to-path: false
+
     - name: install cargo make
       run: cargo install --no-default-features --locked --version 0.37.23 cargo-make
 
@@ -46,5 +52,10 @@ jobs:
     - name: Build sdl with debugger
       run: cargo make sdl_dbg
 
-    - name: Build libretro
-      run: cargo make libretro_desktop
+    - name: Build libretro desktop
+      run: cargo make libretro_desktop
+
+    - name: Build libretro android
+      run: cargo make libretro_android
+      env:
+        ANDROID_NDK_HOME: ${{ steps.setup-ndk.outputs.ndk-path }}