Moderate: gimp security update

[1.2.3-20.9.el3]

• validate bytesperline header field when loading PCX files (#247570)

[1.2.3-20.8.el3]

• reduce GIMP_MAX_IMAGE_SIZE to 2^18 to detect bogus image widths/heights
  (#247570)

[1.2.3-20.7.el3]

• replace gimp_error() by gimp_message()/gimp_quit() in a few plugins so
  they
  don’t crash but gracefully exit when encountering error conditions
• fix endianness issues in the PSP plugin to avoid it doing (seemingly)
  endless
  loops when loading images
• fix endianness issues in the PCX plugin which cause it to not detect
  corrupt
  images

[1.2.3-20.6.el3]

• add ChangeLog entry to psd-invalid-dimensions patch (#247570)
• validate size values read from files before using them to allocate
  memory in
  various file plugins (#247570, patch by Mukund Sivaraman and Rapha??l
  Quinet,
  adapted)
• detect invalid image data when reading files in several plugins (#247570,
  patch by Sven Neumann and Rapha??l Quinet, adapted)
• validate size values read from files before using them to allocate
  memory in
  the PSD and sunras plugins (#247570, patch by Mukund Sivaraman and Sven
  Neumann, partly adapted)
• add safeguard to avoid crashes while loading corrupt PSD images (#247570,
  patch by Rapha??l Quinet, adapted)
• convert spec file to UTF-8

[1.2.3-20.5.el3]

• use adapted upstream PSD fix by Sven Neumann (#244406)

[1.2.3-20.4.el3]

• refuse to open PSD files with insanely large dimensions (#244406)