Switch build to clang for linux.
Mingw binaries isn't working with vanilla hlds / listenserver. And i'm too lazy to debug them.
For consistency reason, linux switched clang, so we're only have clang for linux & osx and msvc for windows.
fix: crash without metamod after few map changes.
fix: move sprites precache into the correct place.
fix: move initialization stuff to post-ServerActivate.
fix: bots try to defuse already beeing defused bomb (fixes#116).
fix: line ending in source code.
fix: do not retreat with sniper weapon, if currently shooting and have ammo.
crlib: added deque class.