Fail when composite type has interface static method

UsageGraph resolution fail:

Caused by: java.lang.NullPointerException
	at org.apache.zest.runtime.composite.MixinsModel$Uses.uses(MixinsModel.java:233)

One instance of the issue can be seen by running FunctionalListTest on a Java 9 vm. The offender in this case is List.of(..) introduced in Java 9.

Interface static methods should be ignored when resolving the usage graph.
Like it's already done when building the composite.