Only set python include directory when python dependency is availble and python bindings build is enabled.
Only set python include directory when python dependency is availble and
python bindings build is enabled.


git-svn-id: e31799a7ad59d6ea355ca047c69e0aee8a59fcd3@3493 53f5c7ee-bee3-0310-bbc5-ea0e15fffd5e

luizluca/opensync-luizluca,luizluca/opensync-luizluca