macOS Android builds: document that only LLVM is supported for now
@@ -164,6 +164,8 @@ On **macOS**:
ANDROID_NDK=:path-to-android-ndk-r21 PATH=$PATH:$ANDROID_NDK/toolchains/llvm/prebuilt/darwin-x86_64/bin CC_aarch64_linux_android=aarch64-linux-android26-clang CXX_aarch64_linux_android=aarch64-linux-android26-clang++ CARGO_TARGET_AARCH64_LINUX_ANDROID_LINKER=aarch64-linux-android26-clang cargo build --target aarch64-linux-android -vv
```
+Note: we don't support Apple's Clang 11 to build for Android on macOS, so you need to install LLVM and set the `PATH` like instructed.
+
On **Linux**:
```bash
