[Build] move core definition into cmake

CMakeLists.txt

@@ -20,7 +20,7 @@
 project(MaNGOS)
 set(MANGOS_VERSION 0.21)
 set(MANGOS_EXP "CLASSIC")
-
+add_definitions(-DCLASSIC)
 # CMake policies
 cmake_minimum_required(VERSION 2.8)
 # Until CMake 3.0 is the standard
@@ -142,6 +142,8 @@ else()
     set(GIT_REVISION "Git not found")
 endif()
 
+set(DEFINITIONS ${DEFINITIONS} CLASSIC)
+
 message(STATUS "MaNGOS-Core revision  : ${GIT_REVISION}")
 message(STATUS "Install server to     : ${CMAKE_INSTALL_PREFIX}")
 message(STATUS "Install configs to    : ${CONF_INSTALL_DIR}")

src/game/Server/SharedDefines.h

@@ -31,7 +31,6 @@
 #ifndef MANGOS
 #define MANGOS
 #endif /* MANGOS */
-#define CLASSIC
 
 enum Gender
 {