guava: Fix build with OpenJDK

Without this patch, building with some versions of OpenJDK fails because
of confusion around the Comparator

Change-Id: I8ff93b01ec1bf233d2b1d74c4e1e753afc9a071b
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
1 file changed