Remove ndk_arch from Android build configurations

Removed ndk_arch entries for Android builds in the workflow.

Author: cloudwebrtc

.github/workflows/ffi-builds.yml

@@ -89,23 +89,20 @@ jobs:
             dylib: liblivekit_ffi.so
             jar: libwebrtc.jar
             target: aarch64-linux-android
-            ndk_arch: aarch64-unknown-linux-musl
             name: ffi-android-arm64
             buildargs: --no-default-features --features "rustls-tls-webpki-roots"
           - os: ubuntu-latest
             platform: android
             dylib: liblivekit_ffi.so
             jar: libwebrtc.jar
             target: armv7-linux-androideabi
-            ndk_arch: arm-unknown-linux-musleabihf
             name: ffi-android-armv7
             buildargs: --no-default-features --features "rustls-tls-webpki-roots"
           - os: ubuntu-latest
             platform: android
             dylib: liblivekit_ffi.so
             jar: libwebrtc.jar
             target: x86_64-linux-android
-            ndk_arch: x86_64-unknown-linux-musl
             name: ffi-android-x86_64
             buildargs: --no-default-features --features "rustls-tls-webpki-roots"
 
@@ -171,7 +168,6 @@ jobs:
         if: ${{ matrix.platform == 'android' }}
         run: |
           cd livekit-ffi/
-          ln -sf $ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/linux-x86_64/lib/${{ matrix.ndk_arch }}/{libunwind.so,libc++abi.a} $ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/linux-x86_64/lib/
           cargo install cargo-ndk
           cargo ndk --target ${{ matrix.target }} build --release ${{ matrix.buildargs }}