buildscripts: build lua with -fPIC
buildscripts: build lua with -fPIC

no concrete advantages now but this makes mpv with meson
work out-of-the-box in case we want to switch to that
in the future

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