Always run oatdumps tests

ART_BUILD_HOST_STATIC is meaningless now, the static tools are always
available.  Add oatdumpds as a dependency of the host oatdump tests, and
always enable the oatdump static tests.

Test: m -j test-art-host-gtest-oatdump_test
Change-Id: Id749f453f82489dc81a2c9042d3cc3120ea3d308