Adding -enable-all-external and -all flags to build all supported extenal libraries

.travis.yml

@@ -17,4 +17,4 @@ install:
   - curl http://archive.ubuntu.com/ubuntu/pool/universe/n/nasm/nasm_2.14.02-1_amd64.deb --output $HOME/nasm_2.14.02-1_amd64.deb
   - sudo dpkg -i $HOME/nasm_2.14.02-1_amd64.deb
 script:
-  - ./ffmpeg-android-maker.sh -vpx -dav1d -mp3lame -aom -opus -wavpack -twolame -speex -android=18
+  - ./ffmpeg-android-maker.sh -all -android=18

scripts/parse-arguments.sh

@@ -13,6 +13,17 @@ SOURCE_VALUE=4.3.1
 BINUTILS=gnu
 EXTERNAL_LIBRARIES=()
 
+ALL_SUPPORTED_LIBRARIES=(
+  "libaom"
+  "libdav1d"
+  "libmp3lame"
+  "libopus"
+  "libwavpack"
+  "libtwolame"
+  "libspeex"
+  "libvpx"
+)
+
 for argument in "$@"; do
   case $argument in
     # Build for only specified ABIs (separated by comma)
@@ -91,6 +102,9 @@ for argument in "$@"; do
   --enable-libvpx|-vpx)
       EXTERNAL_LIBRARIES+=( "libvpx" )
     ;;
+  --enable-all-external|-all)
+    EXTERNAL_LIBRARIES=${ALL_SUPPORTED_LIBRARIES[@]}
+    ;;
     *)
       echo "Unknown argument $argument"
     ;;