ffmpeg: add vpx build_option

libvpx removed support for armv6, this build_option allows building
ffmpeg for armv6 without it.

common/options.description

@@ -79,6 +79,7 @@ desc_option_v4l2="Enable support for V4L2 (Video 4 Linux 2)"
 desc_option_vaapi="Enable support for VA-API"
 desc_option_vapoursynth="Enable support for VapourSynth"
 desc_option_vdpau="Enable support for VDPAU"
+desc_option_vpx="Enable support for VP8/VP9 codecs"
 desc_option_wavpack="Enable support for the Wavpack audio format"
 desc_option_wayland="Enable support for the Wayland backend"
 desc_option_x11="Enable support for X11"

srcpkgs/ffmpeg/template

@@ -13,17 +13,19 @@ hostmakedepends="pkg-config perl yasm"
 makedepends="zlib-devel bzip2-devel freetype-devel alsa-lib-devel libXfixes-devel
  libXext-devel libXvMC-devel faad2-devel lame-devel libtheora-devel
  gnutls-devel libvorbis-devel x264-devel xvidcore-devel jack-devel SDL2-devel
- libcdio-paranoia-devel libvpx-devel librtmp-devel freetype-devel libmodplug-devel
+ libcdio-paranoia-devel librtmp-devel freetype-devel libmodplug-devel
  speex-devel celt-devel harfbuzz-devel libass-devel opus-devel pulseaudio-devel
  ocl-icd-devel $(vopt_if x265 x265-devel) $(vopt_if vaapi libva-devel)
  $(vopt_if vdpau libvdpau-devel) $(vopt_if v4l2 v4l-utils-devel) libbs2b-devel
- libvidstab-devel $(vopt_if faac faac-devel) $(vopt_if fdk_aac fdk-aac-devel)"
+ libvidstab-devel $(vopt_if faac faac-devel) $(vopt_if fdk_aac fdk-aac-devel)
+ $(vopt_if vpx libvpx-devel)"
 
-build_options="x265 v4l2 vaapi vdpau faac fdk_aac"
+build_options="x265 v4l2 vaapi vdpau vpx faac fdk_aac"
 build_options_default="v4l2"
 
 case "$XBPS_TARGET_MACHINE" in
-	i686*|x86_64*) build_options_default+=" x265 vaapi vdpau";;
+	i686*|x86_64*) build_options_default+=" x265 vaapi vdpau vpx";;
+	armv7*|aarch64*) build_options_default+=" vpx"
 esac
 
 do_configure() {
@@ -48,7 +50,7 @@ do_configure() {
 	./configure --prefix=/usr --disable-debug --enable-gpl --enable-gnutls \
 		--enable-libcdio --enable-version3 --enable-runtime-cpudetect \
 		--enable-libmp3lame --enable-libvorbis --enable-libxvid \
-		--enable-libx264 --enable-libvpx --enable-libtheora \
+		--enable-libx264 $(vopt_if vpx --enable-libvpx) --enable-libtheora \
 		--enable-shared --enable-static --enable-x11grab \
 		--enable-libpulse --enable-libfreetype --enable-libmodplug \
 		--enable-libspeex --enable-libcelt --enable-libass \