Security update for libsndfile (moderate)

This update for libsndfile fixes the following issues:

Security issues fixed:

• CVE-2018-13139: Fix a stack-based buffer overflow in psf_memset in
  common.c that allows remote attackers to cause a denial of service
  (bsc#1100167).
• CVE-2017-17456: Prevent segmentation fault in the function
  d2alaw_array() that may have lead to a remote DoS (bsc#1071777)
• CVE-2017-17457: Prevent segmentation fault in the function
  d2ulaw_array() that may have lead to a remote DoS, a different
  vulnerability than CVE-2017-14246 (bsc#1071767)

This update was imported from the SUSE:SLE-15:Update update project.