message: dotest: consistently call finalize_build_dictionary in debug info variants
  dwarf&dwo versions were doing it, but gmodules and dsym weren't. All
  this function does right now is pass OS=Android to make when targeting
  android. This enables us to run dotest without manually passing --env
  OS=Android.
diff: @@ -1510,6 +1510,7 @@ class Base(unittest2.TestCase):
  clean=True):
  """Platform specific way to build binaries with dsym info."""
  module = builder_module()
  + dictionary = lldbplatformutil.finalize_build_dictionary(dictionary)
  if not module.buildDsym(
  self,
  architecture,
  @@ -1560,6 +1561,7 @@ class Base(unittest2.TestCase):
  clean=True):
  """Platform specific way to build binaries with gmodules info."""
  module = builder_module()
  + dictionary = lldbplatformutil.finalize_build_dictionary(dictionary)
  if not module.buildGModules(
  self,
  architecture,
  