travis: add 3ds build script

travis/build-3ds.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+RECIPE=recipes/nintendo/3ds
+
+sudo mkdir -p /home/buildbot/tools
+
+sudo chmod -R 777 /home/buildbot
+
+cd /home/buildbot/tools
+
+wget -O 3ds.tar.xz 'https://github.com/libretro/libretro-toolchains/blob/master/3ds.tar.xz?raw=true'
+
+tar Jkxf 3ds.tar.xz
+
+cd ~/libretro-super
+
+# only build the one core specified in $CORE
+egrep "^$CORE " ${RECIPE} | head -1 >${RECIPE}.new && mv ${RECIPE}.new ${RECIPE}
+
+./libretro-buildbot-recipe.sh ${RECIPE}