Log Message:
Update GraphicsMagick to 1.2.1.

Bug fixes:

  * MAT: Provide a correct error report when the Pixels limit has been
    exceeded.

  * RPM Spec file: Fixed naming of NEWS file. Use included libltdl
    (--with-included-ltdl option) in order to avoid possible issues with
    system libltdl.

  * GraphicsMagick-config script should now output correct dependency
    information for --libs when libltdl is needed.

  * GraphicsMagick++-config no longer depends on GraphicsMagick-config to
    be in the executable search path.

Performance improvments:

  * Module loading and execution performance are improved considerably
    for the modules build. On some systems, the modules build is
    considerably faster than the static or shared builds.

Feature improvements:

  * Updated to libtool 1.2.4.