Attempt to fix v8worker2 caching.

.travis.yml

@@ -3,10 +3,12 @@ go:
  - 1.9.2
 before_cache:
   - ccache -s
+  - mv $GOPATH/src/github.com/ry/v8worker2/out $V8WORKER2_OUT
 cache:
   directories:
     - $HOME/.ccache
     - $PROTOBUF_ROOT
+    - $V8WORKER2_OUT
     # Adding the following makes it fail with:
     #  $ go get ./...
     # dispatch.go:5:2: no Go files in /home/travis/gopath/src/github.com/ry/v8worker2
@@ -15,6 +17,7 @@ env:
   global:
     - USE_CCACHE=1
     - PROTOBUF_ROOT=$HOME/protobuf
+    - V8WORKER2_OUT=$HOME/v8worker2_out
 before_install: |
   # ccache
   unset CCACHE_DISABLE
@@ -34,6 +37,10 @@ before_install: |
 install:
  - env
  - go get -d github.com/ry/v8worker2
+ - |
+   if [ -d $V8WORKER2_OUT ]; then
+     mv $V8WORKER2_OUT $GOPATH/src/github.com/ry/v8worker2/out
+   fi
  - (cd $GOPATH/src/github.com/ry/v8worker2 && ./tools/build.py)
  - go get -u github.com/golang/protobuf/proto
  - go get -u github.com/spf13/afero