ghostscript security and bug fix update

[9.07-31.el7_6.9]

• Related: #1667442 - CVE-2019-6116 - added missing parts of patch
  [9.07-31.el7_6.8]
• Resolves: #1667442 - CVE-2019-6116 ghostscript: subroutines within
  pseudo-operators must themselves be pseudo-operators
  [9.07-31.el7_6.7]
• Resolves: #1665919 pdf2ps reports an error when reading from stdin
• Resolves: #1657333 - CVE-2018-16540 ghostscript: use-after-free in
  copydevice handling (699661)
• Resolves: #1660569 - CVE-2018-19475 ghostscript: access bypass in
  psi/zdevice2.c (700153)
• Resolves: #1660828 - CVE-2018-19476 ghostscript: access bypass in
  psi/zicc.c
• Resolves: #1661278 - CVE-2018-19477 ghostscript: access bypass in
  psi/zfjbig2.c (700168)