travis: add workaround for Travis failing at Android package installs
travis: add workaround for Travis failing at Android package installs

travis-ci/travis-ci#8874

mpv-android/mpv-android,jeeb/mpv-android,mpv-android/mpv-android,jeeb/mpv-android,jeeb/mpv-android,mpv-android/mpv-android,mpv-android/mpv-android,jeeb/mpv-android,jeeb/mpv-android,mpv-android/mpv-android