Adding path to CMAKE_MODULE_PATH is ok all the time

We don't need to protect the build system against adding extra
directories in the CMAKE_MODULE_PATH This also prepares kde-workspace
to be build with a simple CMakeLists.txt in the root directory.

CMakeLists.txt

@@ -3,10 +3,7 @@ project(KWIN)
 cmake_minimum_required(VERSION 2.8.12 FATAL_ERROR)
 set(QT_MIN_VERSION "5.2.0")
 
-# TODO: remove if once we are split
-if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
-    set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules ${CMAKE_MODULE_PATH} )
-endif()
+set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules ${CMAKE_MODULE_PATH} )
 
 find_package(ECM 0.0.11 REQUIRED NO_MODULE)