Log Message:
Update GraphicsMagick to 1.2.3.

1.2.3 (June 5, 2008)
====================

Security Fixes:

  * Cineon reader: Fixed crash with broken file from Sami Liedes.

  * Palm reader: Fixed crash with broken files from Sami Liedes.

  * PICT reader: Fixed crash with broken files from Sami Liedes.

  * DPX reader: Validate file data better to avoid improper operation with
    intentionally (or accidentally) defective files.

  * XCF reader: Fixed crash with broken files from Sami Liedes.

Security Issue Not Fixed:

  * JP2/JPC reader: Several JPEG-2000 files from Sami Liedes "broken"
    collection cause crashes in Jasper. This is not GraphicsMagick's fault.

Bug fixes:

  * Noise generators were only working properly for Q8 build.