Simplifying file 'cmake' now that include directories are set automatically

dlib/cmake

@@ -93,10 +93,7 @@ elseif (MSVC OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC") # else if using Visu
 endif()
 
 
-# Add folder containing dlib to the include search path.
-INCLUDE_DIRECTORIES(${dlib_path}/..)
-
-# This is really optional, but nice.  It will make sure the build mode 
+# This is really optional, but nice.  It will make sure the build mode
 # created by cmake is always release by default.
 include(${dlib_path}/cmake_utils/release_build_by_default)
 
@@ -104,6 +101,5 @@ include(${dlib_path}/cmake_utils/release_build_by_default)
 # Don't add dlib if it's already been added to the cmake project
 if (NOT TARGET dlib)
     add_subdirectory(${dlib_path} dlib_build)
-    INCLUDE_DIRECTORIES(${dlib_needed_includes})
 endif()