Add more caching.

.travis.yml

@@ -7,6 +7,7 @@ cache:
   directories:
   - $HOME/.ccache
   - $HOME/.cache/apt
+  - $HOME/.cache/mpv-build
 
 before_install:
   - mkdir -p $HOME/.cache/apt/partial

scripts/build-mpv.sh

@@ -1,11 +1,15 @@
 #!/bin/bash
 set -ex
 
+export OLDDIR=`pwd`
+
 export CFLAGS="-fPIC -Os"
 
 export CCACHE_SLOPPINESS=time_macros 
 export CCACHE=`which ccache`
 
+cd $HOME/.cache
+
 git clone --depth 1 https://github.com/mpv-player/mpv-build mpv-build || true
 cd mpv-build
 
@@ -32,4 +36,4 @@ echo "--disable-caca --disable-wayland --disable-gl-wayland --disable-libarchive
 ./rebuild -j`nproc`
 sudo ./install
 ccache -s
-cd ..
+cd $OLDDIR