Security update for vlc (important)

This update for vlc to 2.2.4 to fix the following security issue:

• CVE-2016-5108: Fix out-of-bound write in adpcm QT IMA codec (boo#984382).

This also include an update of codecs and libraries to fix these 3rd party
security issues:

• CVE-2016-1514: Matroska libebml EbmlUnicodeString Heap Information Leak
• CVE-2016-1515: Matroska libebml Multiple ElementList Double Free
  Vulnerabilities
• CVE-2015-7981: The png_convert_to_rfc1123 function in png.c in libpng
  allowed remote attackers to obtain sensitive process memory information
  via crafted tIME chunk data in an image file, which triggers an
  out-of-bounds read (bsc#952051).
• CVE-2015-8126: Multiple buffer overflows in the (1) png_set_PLTE and (2)
  png_get_PLTE functions in libpng allowed remote attackers to cause a
  denial of service (application crash) or possibly have unspecified other
  impact via a small bit-depth value in an IHDR (aka image header) chunk
  in a PNG image (bsc#954980).