Fix for including CMake in another project

Change-Id: I1462a4bab8cd5fbf9f529e4ccc355000b10ed026

Author: bfliflet

CMakeLists.txt

@@ -62,7 +62,7 @@ message(STATUS "${CMAKE_BUILD_TYPE} build configuration")
 
 # Set the runtime source directory
 if(NOT DEFINED IGDRCL_SOURCE_DIR)
-	set(IGDRCL_SOURCE_DIR ${CMAKE_SOURCE_DIR})
+	set(IGDRCL_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
 endif()
 
 # Set our build directory