Log Message:
Update to freetype2-2.4.2:

CHANGES BETWEEN 2.4.1 and 2.4.2
  I. IMPORTANT BUG FIXES
    - A stack overflow in CFF Type2 CharStrings interpreter is fixed.
    - Handling Type 42 font deallocation was broken; additionally, the
      library is now more robust against malformed Type 42 fonts.
  II. MISCELLANEOUS
    - Two new functions,  `FT_Reference_Library' (in FT_MODULE_H)  and
      `FT_Reference_Face'  (in  FT_FREETYPE_H),  have  been  added  to
      simplify life-cycle management.  A counter gets initialized to 1
      at the  time an  FT_Library (or  FT_Face) structure  is created.
      The  two  new   functions  increment  the  respective   counter.
      `FT_Done_Library' and `FT_Done_Face' then only destroy a library
      or face if the counter is 1, otherwise they simply decrement the
      counter.