remove prebuilt opus libraries to build from scratch

starting next version 4.49.12 nova manifest contains opus libs for ffmpeg

note that nova git repos contain prebuilt binaries to speed up CI process: these need to be removed for f-droid clean build

metadata/org.courville.nova.yml

@@ -335,6 +335,31 @@ Builds:
     gradleprops:
       - universal
 
+  - versionName: 4.49.12
+    versionCode: 404912
+    commit: v4.49.12_c404912
+    subdir: Video
+    submodules: true
+    sudo:
+      - apt-get update || apt-get update
+      - apt-get install -y -t testing nasm
+      - apt-get install -y ninja-build maven build-essential
+      - pip3 install meson==0.53.2
+    gradle:
+      - noamazon
+    output: build/outputs/apk/noamazon/release/Video-universal-release-unsigned.apk
+    rm:
+      - native/libtorrent/bin*
+      - native/torrentd/libs
+      - native/dav1d-android-builder/build-*
+      - native/ffmpeg-android-builder/dist-full-*
+      - MediaLib/libs/*jar
+      - native/opus-android-builder/lib
+    prebuild: rm -f FileCoreLibrary/libs/*jar
+    ndk: r21d
+    gradleprops:
+      - universal
+
 MaintainerNotes: |-
     aos-fdroid git is dedicated to F-Droid builds and is updated from upstream repos.
     meson version is forced to 0.53.2 because 0.54.0 breaks dav1d's build.