Buildsystem/Linux: Deprecate and remove use of FindTermcap.cmake - it was only used as a solution for older CentOS versions

Core/Genrevision: Move defines from SystemConfig.h file into into revision.h (might need a rename now?) and delete it.
This should remove the infamous "rebuild all of game plzkthx"-symptom when upgrading to newer revisions.

--HG--
branch : trunk

src/server/game/World/World.cpp

@@ -22,10 +22,11 @@
     \ingroup world
 */
 
+#include "revision.h"
+
 #include "Common.h"
 #include "DatabaseEnv.h"
 #include "Config.h"
-#include "SystemConfig.h"
 #include "Log.h"
 #include "Opcodes.h"
 #include "WorldSession.h"