Update GraphicsMagick to 1.3.4.

1.3.4 (January 13, 2009)
=========================

Security Fixes:

  * None.

Bug fixes:

  * Now runs under Windows Vista (as a 32-bit application).

  * Fix for colorspace transform math overflow in Q32 build.

New Features:

  * Windows build supports OpenMP and requires Windows 2000 or later
    (source code still supports Windows '98).

  * Support large files under Windows.

  * Support reading/writing 16 and 24 bit float TIFF files.

  * Support reading/writing 64 bit integer TIFF files.

  * Added "Log", "Max", "Min", and "Pow" options to -operator.

Feature improvements:

  * Debug logging now properly prints 64-bit offset values.

Performance Improvements:

  * Improve resource estimation for Microsoft Windows systems.

(obache)