mpv: only enable rubberband if not cross compiling

srcpkgs/mpv/template

@@ -1,7 +1,7 @@
 # Template file for 'mpv'
 pkgname=mpv
 version=0.16.0
-revision=4
+revision=5
 short_desc="Video player based on MPlayer/mplayer2"
 maintainer="Juan RP <xtraeme@voidlinux.eu>"
 license="GPL-3"
@@ -16,14 +16,18 @@ makedepends="
  libXv-devel libxkbcommon-devel libva-glx-devel libvdpau-devel alsa-lib-devel
  pulseaudio-devel libbluray-devel libcdio-paranoia-devel libdvdread-devel
  MesaLib-devel harfbuzz-devel libXScrnSaver-devel jack-devel libdvdnav-devel
- wayland-devel libuuid-devel libguess-devel libXrandr-devel samba-devel rubberband-devel"
+ wayland-devel libuuid-devel libguess-devel libXrandr-devel samba-devel
+ $(vopt_if build_option_rubberband rubberband-devel)"
 depends="desktop-file-utils hicolor-icon-theme youtube-dl"
 conf_files="/etc/mpv/*.conf"
 distfiles="https://github.com/mpv-player/${pkgname}/archive/v${version}.tar.gz"
 checksum=fc3619de0ede16fbb023ac72589090e8e77fd9d9e03a81adc728105d50ef38ba
 
+build_options="rubberband"
+
 if [ -z "$CROSS_BUILD" ]; then
 	configure_args+=" --enable-zsh-comp"
+	build_options_default+=" rubberband"
 fi
 
 pre_configure() {