Rationale:
- native doesn't report names for SymTagBaseType objects
  => so remove typename for sym_basic
- since symt_basic becomes pretty simple, it's possible to share the object
  across all modules loaded in dbghelp (simplicity, memory usage reduction)
- removed dwarf basic types cache in dwarf.c as we now have a generic one
Signed-off-by: Eric Pouech <eric.pouech@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>