.travis.yml: test that no-default-device builds do not regress

Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

.travis.yml

@@ -149,6 +149,12 @@ matrix:
         - ${SRC_DIR}/scripts/travis/coverage-summary.sh
 
 
+    # We manually include builds which we disable "make check" for
+    - env:
+        - CONFIG="--without-default-devices"
+        - TEST_CMD=""
+
+
     # We manually include builds which we disable "make check" for
     - env:
         - CONFIG="--enable-debug --enable-tcg-interpreter"