run.bash: must make codelab before we can test it.

this will break the build, but it's already silently broken.

R=rsc
CC=golang-dev
https://golang.org/cl/4168041

src/run.bash

@@ -102,6 +102,8 @@ time ./run
 
 [ "$GOHOSTOS" == windows ] ||
 (xcd ../doc/codelab/wiki
+gomake clean
+gomake
 gomake test
 ) || exit $?