Disable CI for ppc64 for now (link errors)

Until root cause is established, disable this target.

Signed-off-by: Paul Osborne <[email protected]>

Author: posborne

.travis.yml

@@ -54,8 +54,8 @@ matrix:
       if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
     - env: TARGET=powerpc-unknown-linux-gnu
       if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
-    - env: TARGET=powerpc64-unknown-linux-gnu
-      if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
+    # - env: TARGET=powerpc64-unknown-linux-gnu
+    #   if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
     - env: TARGET=powerpc64le-unknown-linux-gnu
       if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
     - env: TARGET=s390x-unknown-linux-gnu DISABLE_TESTS=1