Security update for freetype2 (important)

This update for freetype2 fixes the following security issues:

• CVE-2016-10244: Make sure that the parse_charstrings function in
  type1/t1load.c does ensure that a font contains a glyph name to prevent
  a DoS through a heap-based buffer over-read or possibly have unspecified
  other impact via a crafted file (bsc#1028103)
• CVE-2017-8105: Fix an out-of-bounds write caused by a heap-based buffer
  overflow related to the t1_decoder_parse_charstrings function in
  psaux/t1decode.ca (bsc#1035807)
• CVE-2017-8287: an out-of-bounds write caused by a heap-based buffer
  overflow related to the t1_builder_close_contour function in
  psaux/psobjs.c (bsc#1036457)
• Fix several integer overflow issues in truetype/ttinterp.c (bsc#1079600)