[CodExtended] Build.sh for Compiling CoDExtendedv20

[indyda]

Yep, I have this custom version up now if you guys are interested. https://github.com/iindy/CoDExtended

Updates are:
- Removed php's weapon reload modifications
- Removed Steam requirement
- Fixed/Modified chat commands - check the readme for more info
- Removed lingering JS code

Bugs:
- Invisible models (kinda rare)