Add missing art_(debug_)defaults to dex2oat host static libs.

This fixes build breakage on mac since art_defaults disables darwin.

Bug: 169576709
Bug: 145934348
Test: Build ART prebuilt SDK, set prefer:true on prebuilts and build
  platform system image using prebuilts
Test: Build and run out/soong/host/linux-x86/bin/dex2oat(d)
  on linux
Test: build/soong/soong_ui.bash --make-mode \
      TARGET_PRODUCT=sdk TARGET_BUILD_VARIANT=userdebug nothing
  on mac
Change-Id: Iabbfbfd98974b62157d85f84b651bdfef20a122e
1 file changed