Upgrade libevent to use NDK 20
This is based of the current work done in branch for android support. We need to upgrade to build with NDK 21.
Make standalone toolchain is not longer supported in NDK 21 so need to configure to use new locations.
This is based of the current work done in branch for android support. We need to upgrade to build with NDK 21.
Make standalone toolchain is not longer supported in NDK 21 so need to configure to use new locations.