Build: Fix the in-source build prevention

CMakeLists.txt

@@ -11,6 +11,10 @@
 # We require CMake >= 3.0
 cmake_minimum_required(VERSION 3.0)
 
+# add this options before PROJECT keyword
+set(CMAKE_DISABLE_SOURCE_CHANGES ON)
+set(CMAKE_DISABLE_IN_SOURCE_BUILD ON)
+
 # Set projectname (must be done AFTER setting configurationtypes)
 project(TrinityCore)
 
@@ -24,10 +28,6 @@ if(POLICY CMP0054)
   cmake_policy(SET CMP0054 NEW) # Only interpret if() arguments as variables or keywords when unquoted - prevents intepreting if (SOME_STRING_VARIABLE MATCHES "MSVC") as if (SOME_STRING_VARIABLE MATCHES "1")
 endif()
 
-# add this options before PROJECT keyword
-set(CMAKE_DISABLE_SOURCE_CHANGES ON)
-set(CMAKE_DISABLE_IN_SOURCE_BUILD ON)
-
 # Set RPATH-handing (CMake parameters)
 set(CMAKE_SKIP_BUILD_RPATH 0)
 set(CMAKE_BUILD_WITH_INSTALL_RPATH 0)