CMake: use CORRADE_INCLUDE_DIRS instead of CORRADE_INCLUDE_DIR.

modules/FindMagnum.cmake

@@ -209,7 +209,7 @@ endforeach()
 # Dependent libraries and includes
 set(MAGNUM_INCLUDE_DIRS ${MAGNUM_INCLUDE_DIR}
     ${MAGNUM_INCLUDE_DIR}/MagnumExternal/OpenGL
-    ${CORRADE_INCLUDE_DIR})
+    ${CORRADE_INCLUDE_DIRS})
 set(MAGNUM_LIBRARIES ${MAGNUM_LIBRARY}
     ${CORRADE_UTILITY_LIBRARIES}
     ${CORRADE_PLUGINMANAGER_LIBRARIES})

src/CMakeLists.txt

@@ -42,7 +42,7 @@ endif()
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CORRADE_CXX_FLAGS}")
 
-include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR} ${CORRADE_INCLUDE_DIR})
+include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR} ${CORRADE_INCLUDE_DIRS})
 
 # We can use both implicit include path (GLES2/gl2.h) where our headers can
 # be overriden with system ones or explicit (MagnumExternal/OpenGL/GLES2/gl2ext.h)