Merge pull request #793 from cypherstack/epic

Move epic hackfix into build_all.sh and update r21 url

Author: rehrar

scripts/android/build_all.sh

@@ -11,7 +11,7 @@ mkdir -p build
 ./install_ndk.sh
 
 (cd ../../crypto_plugins/flutter_liblelantus/scripts/android && ./build_all.sh ) &
-(cd ../../crypto_plugins/flutter_libepiccash/scripts/android && ./install_ndk.sh && ./build_all.sh )  &
+(cd ../../crypto_plugins/flutter_libepiccash/scripts/android && ./install_ndk.sh && ./build_opensll.sh && ./build_all.sh )  &
 (cd ../../crypto_plugins/flutter_libmonero/scripts/android/ && ./build_all.sh  ) &
 
 wait