Update this package to version 1.6.3, thereby fixing PR 7969 from

Jim Spath.

Changes from previous version include:

+ Version 1.6.3 corrects a memory leak in gd_png.c.  This leak caused a
significant amount of memory to be allocated and not freed when
writing a PNG image.

+ Version 1.6.2 from John Ellson adds two new functions:
gdImageStringTTF gdImageColorResolve

+ Version 1.6.1 incorporates superior PNG reading and writing code
from Greg Roelofs, with minor modifications by Tom Boutell.

+ Version 1.6 features the following changes:
Support for 8-bit palette PNG images has been added.  Support for GIF
has been removed.  This step was taken to completely avoid the legal
controversy regarding the LZW compression algorithm used in GIF.
Unisys holds a patent which is relevant to LZW compression.  PNG is a
superior image format in any case.  Now that PNG is supported by both
Microsoft Internet Explorer and Netscape (in their recent releases),
we highly recommend that GD users upgrade in order to get
well-compressed images in a format which is legally unemcumbered.

+ Version 1.5 featured the following changes:
New GD2 format
Re-arranged source files
Extended I/O capabilities.
Better support for Lincoln Stein's Perl Module
Added functions

+ Version 1.4 features the following changes:
Fixed polygon fill routine (again)
Support for alternate data sources
Support for alternate data destinations
More tolerant when reading GIFs

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