.travis.yml: Remove disable-uuid

Commit 315d318 turned --disable-uuid into a warning only; remove
the check from Travis.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20190215094502.32149-2-dgilbert@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

.travis.yml

@@ -95,7 +95,7 @@ matrix:
 
 
     - env:
-        - CONFIG="--disable-linux-aio --disable-cap-ng --disable-attr --disable-brlapi --disable-uuid --disable-libusb --disable-user --disable-replication"
+        - CONFIG="--disable-linux-aio --disable-cap-ng --disable-attr --disable-brlapi --disable-libusb --disable-user --disable-replication"
 
 
     - env: