Work around a bug with <T> ... <? extends T[]> methods.

Java 6 adds an Arrays.copyOf method that confuses droiddoc into producing
a class "Array" in the anonymous package. I've raised a bug for someone
to work out why and fix this properly (after spending a fairly fruitless
afternoon on it). This work-around filters that out the cruft. I've checked
the generated current.xml file and the generated java.util.Arrays stubs,
and they're both correct. The extent of droiddoc's confusion appears to be
limited to inventing a non-existent class. (My guess is that it doesn't
realize that the element type of the array is a type parameter, not a type,
and it ends up using a default type name of "Array" from somewhere [javadoc
itself?].)

Bug: 2715505
Change-Id: I2ad7ecc819e320a1d209720b3dfbef45bbd89877