#587 WebP and ZStd for TIFF not supported on Windows

[Nils Durner]

1.3.31 downloaded from sf.net

C:>gm convert -compress webp -define tiff:report-warnings=true -debug all IMG_2.tif zstd-test.tif
...
22:12:05 0:01 0.422u 10368 tiff.c/WriteTIFFImage/4282/Coder:
WebP compression not supported. Compression request removed

---

C:>gm convert -compress zstd -define tiff:report-warnings=true -debug all IMG_2.tif zstd-test.tif
...
22:09:00 0:01 0.469u 19272 tiff.c/WriteTIFFImage/4282/Coder:
Zstandard compression not supported. Compression request removed

---

C:>gm version
GraphicsMagick 1.3.31 2018-11-17 Q8 http://www.GraphicsMagick.org/
Copyright (C) 2002-2018 GraphicsMagick Group.
Additional copyrights and licenses apply to this software.
See http://www.GraphicsMagick.org/www/Copyright.html for details.

Feature Support:
Native Thread Safe yes
Large Files (> 32 bit) yes
Large Memory (> 32 bit) yes
BZIP yes
DPS no
FlashPix no
FreeType yes
Ghostscript (Library) no
JBIG yes
JPEG-2000 yes
JPEG yes
Little CMS yes
Loadable Modules yes
OpenMP yes (200203)
PNG yes
TIFF yes
TRIO no
UMEM no
WebP yes
WMF yes
X11 no
XML yes
ZLIB yes

Windows Build Parameters:

MSVC Version: 1500

[Bob Friesenhahn]

The 1.3.34 release will include support for WebP compression in TIFF. Zstd will not be supported yet since we have not yet integrated Zstd into the Visual Studio build.