Disable TypeTag tests when USE_RTTI_FOR_TYPE_TAGS is defined.

Tests using tags from the __PRETTY_FUNCTION__ don't work when using
RTTI to get the type name since the format is different.

This CL disables those tests as they check the proper parsing of a
function not used when USE_RTTI_FOR_TYPE_TAGS is defined.

Bug: 26292405
TEST=FEATURES=test emerge-link libbrillog

Change-Id: I7c3383359bc16faebd493f3da003663916be390d