.travis.yml: drop cris-linux-user from the plugins test

While it shouldn't cause problems we will never get useful information
from cris as it has yet to be converted to the common translator loop.
It also causes the Travis CI to fail for weird reasons which I have so
far been unable to replicate on a normal Xenial system.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20200203090932.19147-17-alex.bennee@linaro.org>

.travis.yml

@@ -387,9 +387,10 @@ matrix:
 
     # Run check-tcg against linux-user (with plugins)
     # we skip sparc64-linux-user until it has been fixed somewhat
+    # we skip cris-linux-user as it doesn't use the common run loop
     - name: "GCC plugins check-tcg (user)"
       env:
-        - CONFIG="--disable-system --enable-plugins --enable-debug-tcg --target-list-exclude=sparc64-linux-user"
+        - CONFIG="--disable-system --enable-plugins --enable-debug-tcg --target-list-exclude=sparc64-linux-user,cris-linux-user"
         - TEST_BUILD_CMD="make -j${JOBS} build-tcg"
         - TEST_CMD="make check-tcg"
         - CACHE_NAME="${TRAVIS_BRANCH}-linux-gcc-debug-tcg"