Log Message:
update of gd to 2.2.4.

Upstream Changelog:
Security

    gdImageCreate() doesn't check for oversized images and as such is prone to \ 
DoS vulnerabilities. (CVE-2016-9317)
    double-free in gdImageWebPtr() (CVE-2016-6912)
    potential unsigned underflow in gd_interpolation.c
    DOS vulnerability in gdImageCreateFromGd2Ctx()

Fixed

    Fix #354: Signed Integer Overflow gd_io.c
    Fix #340: System frozen
    Fix OOB reads of the TGA decompression buffer
    Fix DOS vulnerability in gdImageCreateFromGd2Ctx()
    Fix potential unsigned underflow
    Fix double-free in gdImageWebPtr()
    Fix invalid read in gdImageCreateFromTiffPtr()
    Fix OOB reads of the TGA decompression buffer
    Fix #68: gif: buffer underflow reported by AddressSanitizer
    Avoid potentially dangerous signed to unsigned conversion
    Fix #304: test suite failure in gif/bug00006 [2.2.3]
    Fix #329: GD_BILINEAR_FIXED gdImageScale() can cause black border
    Fix #330: Integer overflow in gdImageScaleBilinearPalette()
    Fix 321: Null pointer dereferences in gdImageRotateInterpolated
    Fix whitespace and add missing comment block
    Fix #319: gdImageRotateInterpolated can have wrong background color
    Fix color quantization documentation
    Fix #309: gdImageGd2() writes wrong chunk sizes on boundaries
    Fix #307: GD_QUANT_NEUQUANT fails to unset trueColor flag
    Fix #300: gdImageClone() assigns res_y = res_x
    Fix #299: Regression regarding gdImageRectangle() with gdImageSetThickness()
    Replace GNU old-style field designators with C89 compatible initializers
    Fix #297: gdImageCrop() converts palette image to truecolor image
    Fix #290: TGA RLE decoding is broken
    Fix unnecessary non NULL checks
    Fix #289: Passing unrecognized formats to gdImageGd2 results in corrupted files
    Fix #280: gdImageWebpEx() quantization parameter is a misnomer
    Publish all gdImageCreateFromWebp*() functions and gdImageWebpCtx()
    Fix issue #276: Sometimes pixels are missing when storing images as BMPs
    Fix issue #275: gdImageBmpCtx() may segfault for non-seekable contexts
    Fix copy&paste error in gdImageScaleBicubicFixed()

Added

    More documentation
    Documentation on GD and GD2 formats
    More tests