Made add_python_module add the tools/python/src folder to the include search

path.

dlib/add_python_module

@@ -38,6 +38,9 @@ endif()
 string(REPLACE "add_python_module" "" dlib_path ${CMAKE_CURRENT_LIST_FILE})
 include(${dlib_path}/cmake)
 
+# Make sure other python interfaces can #include the headers in
+# dclib/tools/python/src if they want to.
+INCLUDE_DIRECTORIES(${dlib_path}/../tools/python/src)
 
 # We put the extra _ on the end of the name just so it's possible to
 # have a module name of dlib and not get a conflict with the target named