new wrap: zstd

[shawnl]

https://github.com/shawnl/zstd-wrap/tree/1.3.3

while upstream has some meson files in contrib/build meson unfortunately does not work with them (although I based my work off them, and fixed the build upstream, which was released with 1.3.3)

• [X] project() has version string
• [X] project() has license string
• [X] if new project, master has tagged commit as only commit
• [X] if new branch, it is branched from master
• [X] contains a readme.txt
• [X] contains an upstream.wrap file
• [X] download link points to authoritative upstream location
• [X] wrap repository contains only build system files
• [ ] merge request is pointed to correct target branch (not master)
• [X] wrap works
• [X] repo does not have useless top level directory (i.e. libfoobar-1.0.0)

[jpakkane]

Repo and branch created here. Thanks.