Fix Shop_GiveClientItem (probably unfinished, need tests)

[RusJJ]

[RusJJ]

Which version of Steamworks you're using?

https://github.com/komashchenko/SteamWorks

[TiBarification]

Which version of Steamworks you're using?

https://github.com/komashchenko/SteamWorks

Why you're using this fork instead of original repository? Also i see this fork is marked as "read-only", I don't think it have any support.

For building we're use http://users.alliedmods.net/~kyles/builds/SteamWorks/ builds and *.inc files for compilation

[TiBarification]

@RusJJ please take a look into https://github.com/FD-Forks/Shop-Core/blob/master/.travis.yml file, there are instructions for compilation shop core.