tris: make Travis-CI use Go 1.9

.travis.yml

@@ -5,7 +5,7 @@ services:
   - docker
 
 go:
-  - 1.7
+  - 1.9.x
 
 env:
   - MODE=interop CLIENT=boring SERVER=boring
@@ -38,8 +38,3 @@ script:
 
 after_script:
   - if [ "$MODE" = "interop" ]; then docker ps -a; docker logs tris-localserver; fi
-
-cache:
-  directories:
-    - _dev/GOROOT
-    - _dev/go

_dev/tris-testclient/build.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
 set -e
 cd "$(dirname "$0")"
-GOOS=linux ../go.sh build -v -i .
+CGO_ENABLED=0 GOOS=linux ../go.sh build -v -i .
 docker build -t tris-testclient .