Security update for jhead (moderate)

This update for jhead fixes the following security issues:

• CVE-2016-3822: jhead remote attackers to execute arbitrary code or cause
  a denial of service (out-of-bounds access) via crafted EXIF data
  (bsc#1108480).
• CVE-2018-16554: The ProcessGpsInfo function may have allowed a remote
  attacker to cause a denial-of-service attack or unspecified other impact
  via a malicious JPEG file, because of inconsistency between float and
  double in a sprintf format string during TAG_GPS_ALT handling
  (bsc#1108480).