Switch build to msvc for windows.

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.

inc/engine.h

@@ -213,6 +213,9 @@ public:
    // this function is checking that pointed by ent pointer obstacle, can be destroyed
    bool isShootableBreakable (edict_t *ent);
 
+   // print the version to server console on startup
+   void printBotVersion ();
+
    // public inlines
 public:
    // get the current time on server