Move dist-cloudabi/ into disabled/.

There is not enough capacity to do automated builds for CloudABI at this
time.

Author: EdSchouten

.travis.yml

@@ -126,8 +126,6 @@ matrix:
       if: branch = auto
     - env: IMAGE=dist-armv7-linux DEPLOY=1
       if: branch = auto
-    - env: IMAGE=dist-cloudabi DEPLOY=1
-      if: branch = auto
     - env: IMAGE=dist-i586-gnu-i586-i686-musl DEPLOY=1
       if: branch = auto
     - env: IMAGE=dist-i686-freebsd DEPLOY=1