slapos/obs: Put back python information

In "Do not harcode version of wanted Python"
(3f930869) the references to pytohn are
dropped, but they are needed during OBS preparation.

component/slapos/obs.cfg

@@ -86,8 +86,12 @@ environment +=
 pre-configure =
   sed -i 's#/opt/slapos/parts/dbus/lib/libdbus-1.la#${dbus:location}/lib/libdbus-1.la#' ${dbus-glib:location}/lib/libdbus-glib-1.la
 environment +=
+  PATH=${pkgconfig:location}/bin:${python:location}/bin:%(PATH)s
   LD_LIBRARY_PATH=${dbus:location}/lib
   LDFLAGS=-L${glib:location}/lib -Wl,-rpath=${glib:location}/lib -L${dbus:location}/lib -Wl,-rpath=${dbus:location}/lib
+  PYTHON=${python:location}/bin/python${python:version}
+  PYTHON_INCLUDES=-I${python:location}/include/python${python:version}
+  PYTHON_LIBS=-L${python:location}/lib -lpython${python:version} -lpthread -ldl -lutil -lm
 post-install =
   sed -i 's#${dbus:location}/lib/libdbus-1.la#/opt/slapos/parts/dbus/lib/libdbus-1.la#' ${dbus-glib:location}/lib/libdbus-glib-1.la